Home
Ask directory
Intro Stats / AP Statistics
February 2023
7
Intro Stats / AP Statistics
Q&A Archive of
February 7, 2023
Select Question
February 7 of 2023
A field-based randomized control trial design was used for this experimental study to quantify the effects of a barefoot training intervention on ankle stability, agility and speed in trained netball players. Players participated in either a program of netball-specific drills with their usual…
Distributions A and B have exactly the same range and the same number of scores. How do their standard deviations compare? Note: the two IV's for number 11 are intervention (barefoot vs netball shoes) and time (beginning of 8 weeks vs end of 8 weeks).
What proportion of the justices have served for longer than the mean service length?
help
Suppose that a variable 𝑥 is normally distributed in a population and that the standard error of the mean of a sample of size 𝑛 = 155 is 1.35. Determine the population standard deviation, 𝜎 . Give your answer precise to at least two decimal places.
add 10 to only the smallest score in question 4.4 (1, 3, 4, 4) to produce another distribution (11, 3, 4, 4). what do you expect the value of us to be the same for both the original and the new distributions
Please help
Distributions A and B have exactly the same range and the same number of scores. How do their standard deviations compare?
A field-based randomized control trial design was used for this experimental study to quantify the effects of a barefoot training intervention on ankle stability, agility and speed in trained netball players. Players participated in either a program of netball-specific drills with their usual…
How many numbers greater than 1 0 0 0 1000 can be formed with the digits 3 , 4 , 6 , 8 , 9 3,4,6,8,9 if a digit cannot occur more than once in a number?
How many numbers greater than 1000 can be formed with the digits 3,4,6,8,9 if a digit cannot occur more than once in a number?
Sample 1: 94 workers were selected and it was found that 50 of them preferred working from home to working in a traditional office. Sample 2: The percentage who prefer working from home to working in a traditional office was reported as 40 percent with a margin of error of (plus or minus) 8…
Given that (A ∪ B)'= ∅, P(A' | B) = 1/3 and P(A) = 6/7. Find P(B).
Assume X1, ..., Xn are independent normal random variables with distribution Xi ∰ N(μi, σi^2). Let Y = ∑i=1^n aiXi, where ai are constants. Show that Y is normally distributed and find the parameters. (Hint. Use m.g.f.)
Your company specializes in setting up local area networks and digital communication systems in a large metropolitan area. During the last 5 years almost all remote communication systems your company has designed utilized cellular telephone modems. However, in some parts of …
Traveler Spending The data show the traveler spending in billions of dollars for recent year for sample of the states_ Round your answers to two decimal places. 20.7 33.2 21.5 58 23.8 110 30.6 24 74 60.8 40.7 45.5 65.6 Part 1 of 3 Find the range. The range is 89.3 Part 2 of 3 Find the variance.…
Traveler Spending The data show the traveler spending in billions of dollars for recent year for sample of the states_ Round your answers to two decimal places. 20.7 33.2 21.5 58 23.8 110 30.6 24 74 60.8 40.7 45.5 65.6 Part 1 of 3 Find the range. The range is 89.3 Part 2 of 3 Find the variance.…
Traveler Spending The data show the traveler spending in billions of dollars for recent year for sample of the states_ Round your answers to two decimal places. 20.7 33.2 21.5 58 23.8 110 30.6 24 74 60.8 40.7 45.5 65.6 Part 1 of 3 Find the range. The range is 89.3 Part 2 of 3 Find the variance.…
Two textbooks are selected at random from a shelf that contains 4 statistics texts, 2 mathematics texts and 3 physics texts. If X is the number of statistics texts and Y is the number of mathematics texts selected, X= number of sta tent Y = number of maths a) construct a table to show the…
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population. The standard deviation are not equal. Testing the claim at the 0.01…
In this exercise, you will conduct a Monte Carlo experiment to study the phenomenon of spurious regression discussed in Section 15.7. In a Monte Carlo study, artificial data are generated using a computer, and then those artificial data are used to calculate the statistics being studied. This…
A mean-variance investor with preferences u(μ, σ) = μ + 2σ^2 allocates a portfolio worth $40,000 to invest between a risk-free asset with a 10 percent return and the market asset with a 30 percent return and standard deviation of 5 percent. The investor will allocate how much ___ dollars to…
Recall from Lecture 10 that a 51% attacker is an attacker who holds at least 51% of the total hash power. Let α represent the proportion of hash power held by this attacker. Then, α ≥ 0.51. Suppose this attacker wants to suppress Carol's transactions by not including any of her…
WellPoint, a telemedicine service online, claims that users of its LiveHealth Online service saved a significant amount of money on a typical visit. A sample of 20 online doctor visits had a mean savings of $71 with a standard deviation of $22.35. Question 1 (1 point) What is the correct Excel…
For data having quartiles of Q1 = 100, Q2 = 120, and Q3 = 160, values above what value will be considered outliers?
Of 375 randomly selected students, 30 said that they planned to work in a rural community. Find 95% confidence interval for the true proportion of all medical students who plan to work in a rural community. My answer is : 0.0525 < p < 0.107 Is this correct? Also, it asked : Refer to the…
In 2000, a random sample of 60 high school graduates in Arizona were asked how much graduation money, in total, they had received as gifts. The mean gift amount in US dollars was $558 and the standard deviation was $52.16. Construct a 95% confidence interval for the population mean amount of…
The standard deviation of sample means σ (standard error of the mean) becomes smaller as you increase the sample size n.
The average length of certain metal pieces is 30 centimeters and a standard deviation of two centimeters. If these lengths are normally distributed, find the probability that a randomly selected bar has a length between 29.3 and 33.5 centimeters.
I need to know how to solve 200 Los Angeles commute times on a TI 84 plus calculator.
An experiment consists of drawing 1 card from a standard 52-card deck. What is the probability of drawing the 5 of clubs?
Monkeypox is a disease caused by a virus in the same family as smallpox. The incubation period for monkeypox is 7-14 days with an average incubation period of 10.5 days. Assume that all monkeypox cases have approximately normally distributed incubation periods with a standard deviation of 2…
A company claims that its product contain on average 155 calories per cup. A consumer agency wanted to check whether or not this claim is true. A random sample of 12 product produced the following data on calories: 135 145 145 149 150 150 150 155 160 170 170 185 Test at 1% significance level…
1. Find the F-test statistic, to 4 decimal places, to test the claim that the variances of the two populations are equal. Both distributions are normal. The populations are independent. The standard deviation of the first sample is 4.76 and 4.544 is the standard deviation of the second sample. …
6. A researcher is interested in depression scores among 20-40 year old single parents. Assume the data follows a normal distribution with a mean of 25 and variance of 7. Use this information to answer the following questions. a) What is the probability a person has a depression score of 27? b)…
Write the ratio for W to L in fraction form for a rectangle with the Length L=90 and width W=25 ( Simplify)
write the ratio for 5 dimes to 4 dollars in fraction form ( simplify your answer)
The NBA randomly selected 626 participants for a survey. They asked 320 men and 306 women if they had superior knowledge about basketball. From the 320 men, 28 felt they did. From the 306 women 9 said they did. If i want to make a 95% confidence interval what assumption is violated in this…
Compute the geometric mean of the following percent increases: 8, 12, 14, 26, and 5. (round to 2 decimal places)* A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?* Suppose P(A) =…
A lecturer wants to know whether the average final grade of all students at a university is in a safe level, which is equal to 70. To find out, the lecturer takes 10 samples of student scores at random and the following is a list of scores: 8 9,8 8,4 10,1 14,4 11,2 9,2 7,2 5,5 9,6…
Random variables which yield numeric responses and can be meaningfully manipulated using conventional arithmetic operations is typically referred as
Please tell me how to "optimize" the objective function of Logistic Regression with Lasso and Ridge. How can we derive that only lasso ridge regression is capable of feature selection?
A 1st Order Multiple Regression Model differs from a Simple Linear Regression in that: It includes a quadratic term It adds at least one additional predictor variable The assumptions are slightly different It includes a qualitative predictor
In testing the hypotheses H0: μ1 - μ2 = 0 vs. H1: μ1 - μ2 > 0, two random samples from two populations of college of business graduates majoring in Economics and Accounting produced the following statistics regarding their starting salaries (in $1000s): n1 = 41, n2 = 61, S1 = 25, S2 = 15,…
Describe a question of interest to you that involves correlation. What two variables are you interested to see if there is a correlation? Do you suspect (just based on your own intuition, understanding) that there would be a positive, negative, or no correlation? Discuss the possibility…
You will complete a Course Project in this course that will span two weeks. The project is broken into two parts. You will complete Part I in Week 6 and Part II in Week 7. In Week 6, Confidence Intervals will be explored, and in Week 7, Hypothesis testing will be explored. A confidence interval…
The PRC board examination has a mean score of 500 points. A review center promises to improve scores on the examination. Assuming that 625 persons enrolled the review center have a mean score of 493 points with a standard deviation of 18.9 points. Will the review center hold its claim at alpha…
What is the most extreme z-score among the following z-scores? That is, which is the farthest away from the average? 0.09 1.92 -2.35 -1.74
(2) What a kind of sampling is " A sampling procedure for which each possible sample of a given size is equally likely to be the one obtained"? Cluster Sampling SRS Systematic Sampling Stratified Sampling its neither clustered sampling nor stratified sampling, tried both answers…
In a genetics experiment on peas, one sample of offspring contained 338 green peas and 219 yellow peas. Based on those results, estimate the probability of getting an offspring pea that is green. Express your answer as a percentage rounded to the nearest hundredth without the % sign.
1. To Generate confidence Interval Estimates for population mean we would need: A: sample mean, z or t value, standard deviation, and sample size. B: point estimate, margin of error c: sample mean, z or t value, standard deviation and sample size D: Any of these
Suppose we wish to assess whether there is a relationship between exercise on campus and students' living arrangements. As part of a survey, graduates were asked where they lived their senior year. The response options were dormitory, on-campus apartment, off-campus apartment, and at home (i.e.…
How do I convert my frequency distribution into a discrete probability distribution? Please show the work so I will know how to do the problem. Thank you. Class Frequency(f) Mid-point (x) (x-xbar) (x-xbar)^2f* (x-xbar)^2 3-8 24 5.5 …
There are n letters and n addressed envelopes. If the letters are placed in the envelopes at random, what is the probability that at least one letter is placed in the right envelope?
Suppose you are interested in how a person's marital status is related to his or her leisure activities. You randomly sample 21 adults and determine the number of hours each person spends per day watching TV or using the Internet for non-work activities.
Suppose that X is an exponentially distributed random variable with λ=0.35. Find each of the following probabilities: A. P(X>1) = B. P(X>0.2) = C. P(X<0.35) = D. P(0.18<X<1.92) =
400 students were randomly sampled from a large university, and 256 said they did not get enough sleep. You are asked to conduct a hypothesis test to check whether this represents a statistically lower proportion than the assumed from 70%, and use a significance level of 0.05 a) Write your…
The number of cases of merlot wine sold by a Barossa Valley Winery in an 8-year period follows. Year Cases of wine 2003 270 2004 356 2005 398 2006 456 2007 358 2008 500 2009 …
The junior girls’ volleyball team has a mean height of 168.1 cm and a standard deviation of 4.8 cm. Joanne is 159 cm tall. What percentage of the team is Joanne shorter than?
Find the total number of random samples of n = 4 accounts from a population of N = 53 accounts. C(n,N) = N! / (n!(N - n)!) = 53! / (4!(53 - 4)!) = 53! / (4!49!)
Since the order of the four bank accounts does not matter, the counting rule for combinations should be used. The formula for determining the number of outcomes when selecting a sample of n objects from a total of N objects is given below. C(n, N) = N! / (n!(N - n)!) Here, we want to collect…
The College Board reports that in a recent year, the mean mathematics SAT score was 515, and the standard deviation was 119. A sample score of 66 is chosen. What is the probability that the sample mean is less than 501? Show all steps.
An urn is made up of 7 blue, 3 white, 6 red, and 5 black tiles. If two tiles are drawn at random, find the probability that: a) One is blue and the other is black. b) One is red and the other is white. c) both are red d) both are white e) Only one is blue f) Only one is black
Which variable is quantitative in ANOVA? a. factor b. independent c. treatment d. dependent
can you please explain how you got the expected values and also show by means of substitution NO.OF PROJECT EXPECTED VALUE($) 1 421,880 2 421,840 3 442,253 4 559,725 5 12,560
What is the main difference between linear models and linear mixed models?
What is a statistically significant result? Select one: a. One that proves our hypothesis to be correct. b. A low probability occurrence. c. One that is rather plausible. d. A large and meaningful result.
Suppose you have a response vector y of length n and a predictor matrix X = (xij) (also known as a design matrix) of dimension n×p, where n > p. A regression model is y = Xβ + ε, where β = (β1,...,βp)′ is the vector of the regression coefficients and ε = (ε1,...,εn)′ is the vector…
A math teacher runs a contest with 12 extremely difficult questions, each having 4 possible answers. You have no idea what the correct answers are, so you guess the answer to each question. What is the probability that you will get at least 2 of the answers correct?
An ordinary (fair) coin is tossed three times. Outcomes are thus triples of heads (h) and tails (t) which is written hth, ttt, etc. For each outcome, let N be the random variable counting the number of heads in each outcome. If the outcome is htt, then N(htt) = 1. Suppose the random variable X…
1. A 90% confidence interval for the proportion of airline reservations being canceled on the day of the flight is (0.038, 0.06). What is the point estimate for the population proportion of all reservations that are canceled on the day of the flight? Round your answer to three decimal…
Out of each 100 products, 96 are ready for purchase by customers. If you selected 27 products, what would be the expected (mean) number that would be ready for purchase by customers? A. 27 b. 96 c. 26 d. 0.96
Please help me with clarity and well structured solution. I posted this same question couple of minutes ago but unfortunately the solution given wasn't clear. Thanks 1. The premier league Football, often referred to as the English Premier League or the EPL is the top level of the English…
Could someone help me analyze this data and help me break it down in greater detail for my research assignment, please? Question: Is there anything more you would like to learn about vaping? Name: Responses: 1. anonymous Yes, if there are any long-term negative health effects from…
Find the 90% confidence interval for the population standard deviation given the following n = 27, s = 7.3, and the distribution is normal. 0.33 < σ < 0.35, 63 < σ < 90.09, 5.97 < σ < 9.49, 5.75 < σ < 10.00.
Suppose that we want to know the proportion of American citizens who have served in the military. In this study, a group of 1200 Americans are asked if they have served. Use this scenario to answer questions 1-5. 1. Identify the population in this study. 2. Identify the sample in this study.…
The last 15 months of sales data are given below: Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2020 13.7 14.7 14.8 13 14 13.4 13.6 14.9 13.5 14.7 15.7 21.9 2021 16.9 16.3 14.7 Xt represents sales in month t. Let Yt = log(Xt) and let Zt = Yt - Yt-12. Then the following model was fitted: Zt =…
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. The following is a random sample of six entertainment expenses (dinner costs for four people) from expense reports submitted by members of the sales force. $357, $332, $309,…
Timmy is conducting a study to determine whether listening to music during a workout makes gym goers run faster or slower. Below are the 10 gym goers' number of minutes running a mile. Perform a hypothesis test using the steps for the repeated measures design. Participants without music with…
In a 4 × 4 ANOVA with 10 participants in each cell, the total SS is 480. If SSR = 50, SSC = 70, and SSW = 288, how large is the F ratio for the interaction of the two factors? Show your process and explanations in detail, too. A) 2.25 B) 4.00 C) 8.50 D) 20.0
Explain a Gauss Markov model and give two examples of such a model. [5 Marks]
Chapter 8 - 8.1 Fitting a line, residuals, and correlation/8.2 Least squares regression - Correlation and Regression: Question 7 Using your favorite statistics software package, you generate a scatter plot with a regression equation and correlation coefficient. The regression equation is…
Based on the data shown below, calculate the correlation coefficient (rounded to three decimal places). x y 1 12.7 2 9.6 3 9.7 4 11.1 5 9.6 6 9.5 7 6.9 8 9.5 ___?___
If n = 150 and ˆp (p-hat) = 0.44, find the margin of error at a 90% confidence level. Give your answer to three decimals.
What is the slope and intercept for the regression equation given this data? X = 74, 82, 37, 15, 5 Y = 96, 81, 39, -10, -9
Delta Airlines' flights from Denver to Dallas are on time 50 % of the time. Suppose 10 flights are randomly selected, and the number on-time flights is recorded. Round answers to 4 decimal places.
Let the sample space be the collection of all possible outcomes of rolling one die. Let A be the event Number rolled is even Let B be the event Number rolled is less than 3 Are events A and B independent? If YES how? If NO why?
In a discrete probability distribution, the probability of occurrence of 0 is 0.25, 1 is 0.5, and 2 is 0.25. What is the variance in this distribution? Group of answer choices 0.2 0.5 0.4 0.1
A college president commissioned a study to find the proportion of students enrolled at her college that binge drink. In the study, 150 out of 320 students admitted to having engaged in binge drinking. a. Find a 99% confidence interval for the proportion of students who engage in binge drinking…
If the variance of a binomial distribution is 12 and probability of success in each trial, p = 0.4, then the no. of trials (n) is equal to
A product has a constant failure rate of 5.5% per year. What is the probability of failure after 4 year?
It's a limited entry draw for the hunting season. Last year, 300 people entered the draw for 25 spots. That gave them a 12 to 1 chance. Now, if I do that this year and include Diesel and Chase, that would give me three chances. How do my odds change?
Municipality of Greentown announces a public procurement notice for the landscape design of the district. The probability of winning for a company that bids for the tender is 0.50. Further, of those which win 60 % are politically connected and of those which do not win 20% are politically…
We have two urns that contain balls. Urn A contains 3 red balls and 5 black balls and Urn B contains 4 red balls and 2 black balls. Suppose we draw a random card from a normal playing deck: if we draw a picture card (Jack, Queen or King), we select a ball from Urn A, and if we do not draw a…
Dear Experts, Please solve this: 1. Let ð‘¥1 + ð‘¥2 + ð‘¥3 + ⋯ + ð‘¥ð‘› be a binomial distribution ð‘(1, ðœƒ) with ð‘“(ð‘¥, ðœƒ) = ðœƒð‘¥(1 − ðœƒ)^(1−ð‘¥). a) Determine the maximum likelihood function 𜃠and ðœŽ^2. b) Show that the maximum likelihood estimators for…
An advertising company plans to market a product to low-income families. A study states that for a particular area, the average income per family is $25,000 and the standard deviation is $6000. If the company plans to target the bottom 14% of the families based on income, find the cutoff…
Each airplane has a capacity for 200 passengers, and overbooking is a common practice in these industries. According to the historical data, each passenger will attend a flight with a probability p attend = 0.9. What is the maximum number of tickets the airline can sell to ensure that no one is…
Under what circumstances would a score that is 15 points above the mean be considered to be the center of the distribution?
1) Suppose a researcher wants to determine if the average height of U.S. female adults is different than 64 inches. What is the null hypothesis? the average female height is less than 64 inches the average female height is greater than 64 inches the average female height is equal to 64…
Player A and Player B play a game in which they alternately toss a pair of dice. The one who is first to get a total of 7 wins the game. Find the probability that Player A (the one who tosses first) will win the game. Find the probability that Player B (the one who tosses second) will win the…
Suppose that an average of 30 customers per hour arrive at the Sticky Donut Shop in accordance with a Poisson process. What is the probability that the next two arrivals will occur within the next 5 minutes? Please show work on paper and how to do on calculator.
A cohort study is conducted to determine whether smoking is associated with the incidence of bronchitis in adults over the age of 40. Smokers and non-smokers are recruited from individuals who shop at CVS stores and are followed by monthly telephone calls until they report developing…
Seanna bought a dress marked 20% off. If the regular price was $28, what was the sale price?
I'd greatly appreciate any help I can get with this statistics problem I've got for homework. Here it is: "In your own words, what does SS tell us about a set of data? Under what circumstances will the value of SS equal 0? Can SS ever be negative? Why or why not?" Thank you in advance for any…
For a certain scatterplot, the value of the correlation coefficient is r = 0.5. Which of the following statements is correct? i. The total sum of squares is half as much as the regression sum of squares. ii. The regression sum of squares is half as much as the total sum of squares. iii. The…
Using Titanic dataset please Build a predictive model that answers the question: “What sort of people were more likely to survive?
The heights of a certain population of corn plants follow a normal distribution with mean 145 cm and standard deviation 22 cm. Find (c) The height of a certain corn plant given that only 10% of corn plants exceed it in height (d) The symmetric interval such that 60% of the heights falls within…
You are dealt one card from a 52-card deck. Calculate the probability of and odds for being dealt a jack or a heart . the probability is? (Type an integer or a simplified fraction.) Part 2 The odds for being dealt a jack or a heart are ? (Type an integer or a simplified fraction.)
Quantiles 100.0% maximum 74 99.5% 74 97.5% 74 90.0% 69 75.0% quartile 65.75 50.0% median 63 25.0% quartile 60 10.0% 57.2 2.5% 48 0.5% 48 0.0% minimum 48 Summary Statistics Mean 63.066667 Std Dev 4.9335819 Std Err Mean 0.9007447 Upper 95% Mean 64.908896 Lower 95% Mean 61.224437 N 30 From the…
Answer the question appropriately. A golf ball is dropped from 15 different heights (in inches) and the height of the bounce is recorded (in inches.) The regression analysis gives the model drop. bounce = -.3 + .69 drop Explain what the slope of the line says about the bounce height and the…
The ABC facility has 213 pieces of equipment in their facility. Each piece of equipment requires routine and/or preventive maintenance each day with a probability of 6% and on average the maintenance requires 12 minutes. As the industrial engineer at this facility, management has shared a…
step by step calculate this operation 27! / (27 - 6)! * 6!
A laundromat has 100 washing machines. Each washing machine requires preventive maintenance and servicing each day with a probability of 5% and the average time that the maintenance requires is 9 minutes. The maintenance team is concerned that they are spending too much time with the preventive…
According to Chebyshev's Theorem, at least what percent of the observations lie within plus and minus 1.35 standard deviations of the mean? Group of answer choices 56% 45% 67% 100%
An entrepreneur faces many bureaucratic and legal hurdles when starting a new business. The World Bank collects information about starting businesses throughout the world. It has determined the time, in days, to complete all the procedures required to start a business. Data for 187 countries…
Suppose a system fails if and only if either events E1 or E2 occur but E3 does not occur. Find the probability of system failure if the events E1, E2, and E3 are independent of each other, E1 and E2 are mutually exclusive, and if P(E1) = 0.4, P(E2) = 0.35, and P(E3) = 0.1
please use R to answer the questions. present or attach relevant R outputs used to answer the questions
Open the data file DF2.11C (found in the LBRT #1 folder where you accessed this quiz). Using the data in the column headed "Amenities" to determine the value (to one decimal place) for each of the following: Accommodation…
For a standard normal distribution, find: P(0.45 < z < 2.43) (round to 3 decimal places)
Show that P(A△B) = P(A ∩ B) + P(B ∩ A). Hint: use the properties of set and probability measures.
The average monthly sales volume (in thousands of dollars) for a firm depends on the number of hours x of training of its sales staff, according to the following equation. (Give exact answers. Do not round.) S(x) = (5/x) + 60 + (x/5), 5 ≤ x ≤ 100 (a) Find lim x→5+ S(x). (thousand…
Initial public offerings' prospectuses were examined. In a random sample of 60 prospectuses in which sales forecasts were disclosed, the mean debt-to-equity ratio prior to the offering issue was 3.8, and the sample standard deviation was 5.14. For an independent random sample of 41 prospectuses…
Discuss 3 ways that we use statistics on a regular basis
Instructions: In an APA formatted Word document, complete the following: Use the attached dataset for our company to address the following. Task assignments to employees are supposed to be done at random. On a certain day, all the best jobs, in order of desirability, were given to the men. Is…
DATAfile: Corporate Bonds You may need to use the appropriate technology to answer this question. A sample containing years to maturity and (percent) yield for 40 corporate bonds is contained in the data file named CorporateBonds. A) Develop an estimated regression equation with years to…
A sample with 48 observations has a mean value of 3.0 and a sample standard deviation of 14.5. What would be the test statistic for the null hypothesis that the true population mean is zero? (Enter a positive number rounded to the nearest 0.1.
A sample of 500 shoppers was selected in a large metropolitan area to determine various information concerning consumer behavior. Among the questions asked was, "Do you enjoy shopping for clothing?" Of 240 males, 136 answered yes. Of 260 females, 224 answered yes. What are the critical values…
Using the workout method find out how many salespeople a company should hire based on following information :number of large accounts Large 20,000 , medium 30,000, small 50,000 number of visits made to these accounts per year 24, 18, and 12 respectively time spent on each account per visit 1…
A stem and leaf plot is the same as a boxplot. a part of a small tree. a picture of a distribution. useful for describing categorical variables.
As a new data scientist for a computer selling company, you have been asked to provide analytics for an important business initiative. Your data is well-sourced and readily available. You're ready to start digging in – only to discover that the data you were given doesn't match up well. The…
A research is conducted to study the relationship between the electricity power consumption per hour during the peak period and the monthly electricity power consumption. The electricity.csv dataset contains the data of hourly consumption during the peak period (Y) and the monthly consumption…
Suppose that a company's annual sales were $1,200,000 in 1999. The annual growth rate of sales from 1999 to 2000 was 16 percent, from 2000 to 2001 it was -5 percent, and from 2001 to 2002 it was 22 percent. The geometric mean growth rate of sales over this three-year period is calculated as…
Suppose you run a marketing firm that is hired by a car dealership. One of the variables of interest is the color of the car. Your firm interviewed 100 people and asked them to choose their favorite color from the list of ten colors offered by the manufacturer. Which of the three measures of…
The original DVD release of Dragon Ball Z in the United States contains 86 DVDs. (a) You like to watch the series before school every day. Suppose you watch a different DVD Monday through Friday. How many different viewing schedules (i.e., if you watch DVD 17 on Monday and DVD 5 on Thursday,…
What would be categorical data about COVID-19? And what would be numerical data about COVID-19? Please provide examples highlighting the main differences.
A food processor packages orange juice jars. The weights of the filled jars are approximately normally distributed with a mean of 10.5 ounces and a standard deviation of 0.3 ounces. Find the proportion of all jars packaged by the process that have weight that falls below 10.875 ounces
The test scores of 600 students are normally distributed with a mean of 76 and a standard deviation of 8. The instructor in the class had decreed that the top 15% of the students will be given a B+ on the test. What score is at the lower limit of the range which defines getting a B+? 2. The…
Construct a box plot from the given data. Scores on a Statistics Test: 83,73,89,77,62,87,55,72,65,76 Answer Keyboard Shortcuts Draw the box plot by selecting each of the five movable parts to the appropriate position. Construct a box plot from the given data. Scores on a Statistics…
Hi Please I would like to confirm my work on the question below: Gambling with an unfair die: An unfair die has unusual numbers on its six faces. If X = the outcome of one roll of the die, then the pmf is seen below. Suppose that every time you roll this die, you win a number of dollars equal…
For each data value, calculate the deviation from the mean. Data Value Deviations from the Mean 345 46 292 -7 334 35 276 -23 248 -51 (b) Verify that, except for the effect of rounding, the sum of the five deviations from the mean is equal to 0 for this data set. (If you rounded the sample…
Suppose that A and B are independent events such that the probability that neither occurs is a and the probability of B is b. Show that P(A) = 1 - b - a / 1 - b.
Which of the following assumptions is NOT made in LP models? Group of answer choices Integrality Divisibility Proportionality Certainty
Even as traditional markets for sweetgum lumber have declined, large section solid timbers traditionally used for construction bridges and mats have become increasingly scarce. The article "Development of Novel Industrial Laminated Planks from Sweetgum Lumber" (J. of Bridge Eng., 2008: 64–66)…
Let Xâ‚, Xâ‚‚, ..., Xâ‚™ be i.i.d. random variables with the PDF given by f(x) = 2x/θ², 0 < x < θ, θ > 0. (1) Find the PDF of Xâ‚™ = maxâ‚≤i≤n Xáµ¢. (2) Find the PDF of Xâ‚ = minâ‚≤i≤n Xáµ¢.
Compare the dispersion in study regions (x) and (y)? 1.The absolute and relative dispersions are similar for regions (x) and (y) 2.The absolute dispersion is higher for region (y); the relative dispersion is higher for region (x) 3.The absolute dispersion is similar for (x) and (y);…
Find the generating function G_X(t) = E(t^X) when X is a geometric random variable, i.e. for x in {1, 2, ...} it is given that P(X=x) = (1/2)^x.
Our math club has 20 members, 3 officers: President, Vice President, and Treasurer, and 17 workers: W1, W2, W3, ..., W17. However, one member, Ali, hates another member, Brenda. How many ways can we fill the officer slots and worker slots if Ali refuses to serve as an officer if Brenda is also…
You intend to estimate a population mean with a confidence interval. The population standard deviation is unknown. You believe the population to have a normal distribution. Your sample size is 48. Find the positive critical value that corresponds to a confidence level of 90%. (Round answer to…
List three fields that you would include for a database for a music store.
You are given the following (x,y) data: X 6 -5 1 -2 Y 2 1 0 -3 What is the value of the correlation coefficient, r? 0.43 0.21 0.13 0.85 1.28
Mr. Smith invests only a part of his wealth into a risky asset that has a positive return of 10% with probability 𜋠and has a negative return of -4% with probability 1 - ðœ‹. The risk-free rate is 1%. Mr. Smith's utility function is ð‘¢ = ln(ð‘¤), where 𑤠is his wealth. Which of the…
You wish to test the following claim (Ha) at a significance level of α=0.01. Ho: μ = 57.2 Ha: μ < 57.2 You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n = 16 with mean xÌ„ = 48.7 and a standard deviation of SD =…
given: P(A) = 0.48 P(B) = 0.3 P(A ∪ B) = 0.57 (a) P(Ac) (b) P(Bc) (c) P(A ∩ B) (d) P((A ∪ B)c) (e) P(Ac ∪ B) (f) P(A ∩ Bc)
The years worked by a group of nurses and their monthly income in dollars are related by the following equation: y = 42.15x + 1158.1 If the line is a good predictor, indicate what salary a nurse who has been working for 5 years is expected to have. A/ ___________ Dollars. The years worked by…
What proportion of the justices have served for longer than the mean service length?
help
Suppose that a variable 𝑥 is normally distributed in a population and that the standard error of the mean of a sample of size 𝑛 = 155 is 1.35. Determine the population standard deviation, 𝜎 . Give your answer precise to at least two decimal places.
add 10 to only the smallest score in question 4.4 (1, 3, 4, 4) to produce another distribution (11, 3, 4, 4). what do you expect the value of us to be the same for both the original and the new distributions
Please help
Distributions A and B have exactly the same range and the same number of scores. How do their standard deviations compare?
How many numbers greater than 1 0 0 0 1000 can be formed with the digits 3 , 4 , 6 , 8 , 9 3,4,6,8,9 if a digit cannot occur more than once in a number?
How many numbers greater than 1000 can be formed with the digits 3,4,6,8,9 if a digit cannot occur more than once in a number?
Given that (A ∪ B)'= ∅, P(A' | B) = 1/3 and P(A) = 6/7. Find P(B).
Assume X1, ..., Xn are independent normal random variables with distribution Xi ∰ N(μi, σi^2). Let Y = ∑i=1^n aiXi, where ai are constants. Show that Y is normally distributed and find the parameters. (Hint. Use m.g.f.)
Traveler Spending The data show the traveler spending in billions of dollars for recent year for sample of the states_ Round your answers to two decimal places. 20.7 33.2 21.5 58 23.8 110 30.6 24 74 60.8 40.7 45.5 65.6 Part 1 of 3 Find the range. The range is 89.3 Part 2 of 3 Find the variance.…
Traveler Spending The data show the traveler spending in billions of dollars for recent year for sample of the states_ Round your answers to two decimal places. 20.7 33.2 21.5 58 23.8 110 30.6 24 74 60.8 40.7 45.5 65.6 Part 1 of 3 Find the range. The range is 89.3 Part 2 of 3 Find the variance.…
Traveler Spending The data show the traveler spending in billions of dollars for recent year for sample of the states_ Round your answers to two decimal places. 20.7 33.2 21.5 58 23.8 110 30.6 24 74 60.8 40.7 45.5 65.6 Part 1 of 3 Find the range. The range is 89.3 Part 2 of 3 Find the variance.…
A hypothesis will test that two population means are equal. A sample of 10 with a standard deviation of 3 is selected from the first population and a sample of 15 with a standard deviation of 8 from the second population. The standard deviation are not equal. Testing the claim at the 0.01…
In this exercise, you will conduct a Monte Carlo experiment to study the phenomenon of spurious regression discussed in Section 15.7. In a Monte Carlo study, artificial data are generated using a computer, and then those artificial data are used to calculate the statistics being studied. This…
A mean-variance investor with preferences u(μ, σ) = μ + 2σ^2 allocates a portfolio worth $40,000 to invest between a risk-free asset with a 10 percent return and the market asset with a 30 percent return and standard deviation of 5 percent. The investor will allocate how much ___ dollars to…
Recall from Lecture 10 that a 51% attacker is an attacker who holds at least 51% of the total hash power. Let α represent the proportion of hash power held by this attacker. Then, α ≥ 0.51. Suppose this attacker wants to suppress Carol's transactions by not including any of her…
WellPoint, a telemedicine service online, claims that users of its LiveHealth Online service saved a significant amount of money on a typical visit. A sample of 20 online doctor visits had a mean savings of $71 with a standard deviation of $22.35. Question 1 (1 point) What is the correct Excel…
For data having quartiles of Q1 = 100, Q2 = 120, and Q3 = 160, values above what value will be considered outliers?
Of 375 randomly selected students, 30 said that they planned to work in a rural community. Find 95% confidence interval for the true proportion of all medical students who plan to work in a rural community. My answer is : 0.0525 < p < 0.107 Is this correct? Also, it asked : Refer to the…
In 2000, a random sample of 60 high school graduates in Arizona were asked how much graduation money, in total, they had received as gifts. The mean gift amount in US dollars was $558 and the standard deviation was $52.16. Construct a 95% confidence interval for the population mean amount of…
The standard deviation of sample means σ (standard error of the mean) becomes smaller as you increase the sample size n.
The average length of certain metal pieces is 30 centimeters and a standard deviation of two centimeters. If these lengths are normally distributed, find the probability that a randomly selected bar has a length between 29.3 and 33.5 centimeters.
I need to know how to solve 200 Los Angeles commute times on a TI 84 plus calculator.
An experiment consists of drawing 1 card from a standard 52-card deck. What is the probability of drawing the 5 of clubs?
Monkeypox is a disease caused by a virus in the same family as smallpox. The incubation period for monkeypox is 7-14 days with an average incubation period of 10.5 days. Assume that all monkeypox cases have approximately normally distributed incubation periods with a standard deviation of 2…
A company claims that its product contain on average 155 calories per cup. A consumer agency wanted to check whether or not this claim is true. A random sample of 12 product produced the following data on calories: 135 145 145 149 150 150 150 155 160 170 170 185 Test at 1% significance level…
1. Find the F-test statistic, to 4 decimal places, to test the claim that the variances of the two populations are equal. Both distributions are normal. The populations are independent. The standard deviation of the first sample is 4.76 and 4.544 is the standard deviation of the second sample. …
6. A researcher is interested in depression scores among 20-40 year old single parents. Assume the data follows a normal distribution with a mean of 25 and variance of 7. Use this information to answer the following questions. a) What is the probability a person has a depression score of 27? b)…
Write the ratio for W to L in fraction form for a rectangle with the Length L=90 and width W=25 ( Simplify)
write the ratio for 5 dimes to 4 dollars in fraction form ( simplify your answer)
The NBA randomly selected 626 participants for a survey. They asked 320 men and 306 women if they had superior knowledge about basketball. From the 320 men, 28 felt they did. From the 306 women 9 said they did. If i want to make a 95% confidence interval what assumption is violated in this…
Compute the geometric mean of the following percent increases: 8, 12, 14, 26, and 5. (round to 2 decimal places)* A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?* Suppose P(A) =…
A lecturer wants to know whether the average final grade of all students at a university is in a safe level, which is equal to 70. To find out, the lecturer takes 10 samples of student scores at random and the following is a list of scores: 8 9,8 8,4 10,1 14,4 11,2 9,2 7,2 5,5 9,6…
Random variables which yield numeric responses and can be meaningfully manipulated using conventional arithmetic operations is typically referred as
Please tell me how to "optimize" the objective function of Logistic Regression with Lasso and Ridge. How can we derive that only lasso ridge regression is capable of feature selection?
A 1st Order Multiple Regression Model differs from a Simple Linear Regression in that: It includes a quadratic term It adds at least one additional predictor variable The assumptions are slightly different It includes a qualitative predictor
In testing the hypotheses H0: μ1 - μ2 = 0 vs. H1: μ1 - μ2 > 0, two random samples from two populations of college of business graduates majoring in Economics and Accounting produced the following statistics regarding their starting salaries (in $1000s): n1 = 41, n2 = 61, S1 = 25, S2 = 15,…
Describe a question of interest to you that involves correlation. What two variables are you interested to see if there is a correlation? Do you suspect (just based on your own intuition, understanding) that there would be a positive, negative, or no correlation? Discuss the possibility…
You will complete a Course Project in this course that will span two weeks. The project is broken into two parts. You will complete Part I in Week 6 and Part II in Week 7. In Week 6, Confidence Intervals will be explored, and in Week 7, Hypothesis testing will be explored. A confidence interval…
The PRC board examination has a mean score of 500 points. A review center promises to improve scores on the examination. Assuming that 625 persons enrolled the review center have a mean score of 493 points with a standard deviation of 18.9 points. Will the review center hold its claim at alpha…
What is the most extreme z-score among the following z-scores? That is, which is the farthest away from the average? 0.09 1.92 -2.35 -1.74
(2) What a kind of sampling is " A sampling procedure for which each possible sample of a given size is equally likely to be the one obtained"? Cluster Sampling SRS Systematic Sampling Stratified Sampling its neither clustered sampling nor stratified sampling, tried both answers…
In a genetics experiment on peas, one sample of offspring contained 338 green peas and 219 yellow peas. Based on those results, estimate the probability of getting an offspring pea that is green. Express your answer as a percentage rounded to the nearest hundredth without the % sign.
1. To Generate confidence Interval Estimates for population mean we would need: A: sample mean, z or t value, standard deviation, and sample size. B: point estimate, margin of error c: sample mean, z or t value, standard deviation and sample size D: Any of these
Suppose we wish to assess whether there is a relationship between exercise on campus and students' living arrangements. As part of a survey, graduates were asked where they lived their senior year. The response options were dormitory, on-campus apartment, off-campus apartment, and at home (i.e.…
How do I convert my frequency distribution into a discrete probability distribution? Please show the work so I will know how to do the problem. Thank you. Class Frequency(f) Mid-point (x) (x-xbar) (x-xbar)^2f* (x-xbar)^2 3-8 24 5.5 …
There are n letters and n addressed envelopes. If the letters are placed in the envelopes at random, what is the probability that at least one letter is placed in the right envelope?
Suppose you are interested in how a person's marital status is related to his or her leisure activities. You randomly sample 21 adults and determine the number of hours each person spends per day watching TV or using the Internet for non-work activities.
Suppose that X is an exponentially distributed random variable with λ=0.35. Find each of the following probabilities: A. P(X>1) = B. P(X>0.2) = C. P(X<0.35) = D. P(0.18<X<1.92) =
400 students were randomly sampled from a large university, and 256 said they did not get enough sleep. You are asked to conduct a hypothesis test to check whether this represents a statistically lower proportion than the assumed from 70%, and use a significance level of 0.05 a) Write your…
The number of cases of merlot wine sold by a Barossa Valley Winery in an 8-year period follows. Year Cases of wine 2003 270 2004 356 2005 398 2006 456 2007 358 2008 500 2009 …
The junior girls’ volleyball team has a mean height of 168.1 cm and a standard deviation of 4.8 cm. Joanne is 159 cm tall. What percentage of the team is Joanne shorter than?
Find the total number of random samples of n = 4 accounts from a population of N = 53 accounts. C(n,N) = N! / (n!(N - n)!) = 53! / (4!(53 - 4)!) = 53! / (4!49!)
Since the order of the four bank accounts does not matter, the counting rule for combinations should be used. The formula for determining the number of outcomes when selecting a sample of n objects from a total of N objects is given below. C(n, N) = N! / (n!(N - n)!) Here, we want to collect…
The College Board reports that in a recent year, the mean mathematics SAT score was 515, and the standard deviation was 119. A sample score of 66 is chosen. What is the probability that the sample mean is less than 501? Show all steps.
An urn is made up of 7 blue, 3 white, 6 red, and 5 black tiles. If two tiles are drawn at random, find the probability that: a) One is blue and the other is black. b) One is red and the other is white. c) both are red d) both are white e) Only one is blue f) Only one is black
Which variable is quantitative in ANOVA? a. factor b. independent c. treatment d. dependent
can you please explain how you got the expected values and also show by means of substitution NO.OF PROJECT EXPECTED VALUE($) 1 421,880 2 421,840 3 442,253 4 559,725 5 12,560
What is the main difference between linear models and linear mixed models?
What is a statistically significant result? Select one: a. One that proves our hypothesis to be correct. b. A low probability occurrence. c. One that is rather plausible. d. A large and meaningful result.
Suppose you have a response vector y of length n and a predictor matrix X = (xij) (also known as a design matrix) of dimension n×p, where n > p. A regression model is y = Xβ + ε, where β = (β1,...,βp)′ is the vector of the regression coefficients and ε = (ε1,...,εn)′ is the vector…
A math teacher runs a contest with 12 extremely difficult questions, each having 4 possible answers. You have no idea what the correct answers are, so you guess the answer to each question. What is the probability that you will get at least 2 of the answers correct?
An ordinary (fair) coin is tossed three times. Outcomes are thus triples of heads (h) and tails (t) which is written hth, ttt, etc. For each outcome, let N be the random variable counting the number of heads in each outcome. If the outcome is htt, then N(htt) = 1. Suppose the random variable X…
1. A 90% confidence interval for the proportion of airline reservations being canceled on the day of the flight is (0.038, 0.06). What is the point estimate for the population proportion of all reservations that are canceled on the day of the flight? Round your answer to three decimal…
Out of each 100 products, 96 are ready for purchase by customers. If you selected 27 products, what would be the expected (mean) number that would be ready for purchase by customers? A. 27 b. 96 c. 26 d. 0.96
Please help me with clarity and well structured solution. I posted this same question couple of minutes ago but unfortunately the solution given wasn't clear. Thanks 1. The premier league Football, often referred to as the English Premier League or the EPL is the top level of the English…
Could someone help me analyze this data and help me break it down in greater detail for my research assignment, please? Question: Is there anything more you would like to learn about vaping? Name: Responses: 1. anonymous Yes, if there are any long-term negative health effects from…
In order to control costs, a company wishes to study the amount of money its sales force spends entertaining clients. The following is a random sample of six entertainment expenses (dinner costs for four people) from expense reports submitted by members of the sales force. $357, $332, $309,…
Timmy is conducting a study to determine whether listening to music during a workout makes gym goers run faster or slower. Below are the 10 gym goers' number of minutes running a mile. Perform a hypothesis test using the steps for the repeated measures design. Participants without music with…
In a 4 × 4 ANOVA with 10 participants in each cell, the total SS is 480. If SSR = 50, SSC = 70, and SSW = 288, how large is the F ratio for the interaction of the two factors? Show your process and explanations in detail, too. A) 2.25 B) 4.00 C) 8.50 D) 20.0
Explain a Gauss Markov model and give two examples of such a model. [5 Marks]
Chapter 8 - 8.1 Fitting a line, residuals, and correlation/8.2 Least squares regression - Correlation and Regression: Question 7 Using your favorite statistics software package, you generate a scatter plot with a regression equation and correlation coefficient. The regression equation is…
Based on the data shown below, calculate the correlation coefficient (rounded to three decimal places). x y 1 12.7 2 9.6 3 9.7 4 11.1 5 9.6 6 9.5 7 6.9 8 9.5 ___?___
If n = 150 and ˆp (p-hat) = 0.44, find the margin of error at a 90% confidence level. Give your answer to three decimals.
What is the slope and intercept for the regression equation given this data? X = 74, 82, 37, 15, 5 Y = 96, 81, 39, -10, -9
Delta Airlines' flights from Denver to Dallas are on time 50 % of the time. Suppose 10 flights are randomly selected, and the number on-time flights is recorded. Round answers to 4 decimal places.
Let the sample space be the collection of all possible outcomes of rolling one die. Let A be the event Number rolled is even Let B be the event Number rolled is less than 3 Are events A and B independent? If YES how? If NO why?
In a discrete probability distribution, the probability of occurrence of 0 is 0.25, 1 is 0.5, and 2 is 0.25. What is the variance in this distribution? Group of answer choices 0.2 0.5 0.4 0.1
A college president commissioned a study to find the proportion of students enrolled at her college that binge drink. In the study, 150 out of 320 students admitted to having engaged in binge drinking. a. Find a 99% confidence interval for the proportion of students who engage in binge drinking…
If the variance of a binomial distribution is 12 and probability of success in each trial, p = 0.4, then the no. of trials (n) is equal to
A product has a constant failure rate of 5.5% per year. What is the probability of failure after 4 year?
It's a limited entry draw for the hunting season. Last year, 300 people entered the draw for 25 spots. That gave them a 12 to 1 chance. Now, if I do that this year and include Diesel and Chase, that would give me three chances. How do my odds change?
Municipality of Greentown announces a public procurement notice for the landscape design of the district. The probability of winning for a company that bids for the tender is 0.50. Further, of those which win 60 % are politically connected and of those which do not win 20% are politically…
We have two urns that contain balls. Urn A contains 3 red balls and 5 black balls and Urn B contains 4 red balls and 2 black balls. Suppose we draw a random card from a normal playing deck: if we draw a picture card (Jack, Queen or King), we select a ball from Urn A, and if we do not draw a…
Dear Experts, Please solve this: 1. Let ð‘¥1 + ð‘¥2 + ð‘¥3 + ⋯ + ð‘¥ð‘› be a binomial distribution ð‘(1, ðœƒ) with ð‘“(ð‘¥, ðœƒ) = ðœƒð‘¥(1 − ðœƒ)^(1−ð‘¥). a) Determine the maximum likelihood function 𜃠and ðœŽ^2. b) Show that the maximum likelihood estimators for…
An advertising company plans to market a product to low-income families. A study states that for a particular area, the average income per family is $25,000 and the standard deviation is $6000. If the company plans to target the bottom 14% of the families based on income, find the cutoff…
Each airplane has a capacity for 200 passengers, and overbooking is a common practice in these industries. According to the historical data, each passenger will attend a flight with a probability p attend = 0.9. What is the maximum number of tickets the airline can sell to ensure that no one is…
Under what circumstances would a score that is 15 points above the mean be considered to be the center of the distribution?
1) Suppose a researcher wants to determine if the average height of U.S. female adults is different than 64 inches. What is the null hypothesis? the average female height is less than 64 inches the average female height is greater than 64 inches the average female height is equal to 64…
Player A and Player B play a game in which they alternately toss a pair of dice. The one who is first to get a total of 7 wins the game. Find the probability that Player A (the one who tosses first) will win the game. Find the probability that Player B (the one who tosses second) will win the…
Suppose that an average of 30 customers per hour arrive at the Sticky Donut Shop in accordance with a Poisson process. What is the probability that the next two arrivals will occur within the next 5 minutes? Please show work on paper and how to do on calculator.
A cohort study is conducted to determine whether smoking is associated with the incidence of bronchitis in adults over the age of 40. Smokers and non-smokers are recruited from individuals who shop at CVS stores and are followed by monthly telephone calls until they report developing…
Seanna bought a dress marked 20% off. If the regular price was $28, what was the sale price?
I'd greatly appreciate any help I can get with this statistics problem I've got for homework. Here it is: "In your own words, what does SS tell us about a set of data? Under what circumstances will the value of SS equal 0? Can SS ever be negative? Why or why not?" Thank you in advance for any…
For a certain scatterplot, the value of the correlation coefficient is r = 0.5. Which of the following statements is correct? i. The total sum of squares is half as much as the regression sum of squares. ii. The regression sum of squares is half as much as the total sum of squares. iii. The…
Using Titanic dataset please Build a predictive model that answers the question: “What sort of people were more likely to survive?
The heights of a certain population of corn plants follow a normal distribution with mean 145 cm and standard deviation 22 cm. Find (c) The height of a certain corn plant given that only 10% of corn plants exceed it in height (d) The symmetric interval such that 60% of the heights falls within…
You are dealt one card from a 52-card deck. Calculate the probability of and odds for being dealt a jack or a heart . the probability is? (Type an integer or a simplified fraction.) Part 2 The odds for being dealt a jack or a heart are ? (Type an integer or a simplified fraction.)
Quantiles 100.0% maximum 74 99.5% 74 97.5% 74 90.0% 69 75.0% quartile 65.75 50.0% median 63 25.0% quartile 60 10.0% 57.2 2.5% 48 0.5% 48 0.0% minimum 48 Summary Statistics Mean 63.066667 Std Dev 4.9335819 Std Err Mean 0.9007447 Upper 95% Mean 64.908896 Lower 95% Mean 61.224437 N 30 From the…
Answer the question appropriately. A golf ball is dropped from 15 different heights (in inches) and the height of the bounce is recorded (in inches.) The regression analysis gives the model drop. bounce = -.3 + .69 drop Explain what the slope of the line says about the bounce height and the…
The ABC facility has 213 pieces of equipment in their facility. Each piece of equipment requires routine and/or preventive maintenance each day with a probability of 6% and on average the maintenance requires 12 minutes. As the industrial engineer at this facility, management has shared a…
step by step calculate this operation 27! / (27 - 6)! * 6!
A laundromat has 100 washing machines. Each washing machine requires preventive maintenance and servicing each day with a probability of 5% and the average time that the maintenance requires is 9 minutes. The maintenance team is concerned that they are spending too much time with the preventive…
According to Chebyshev's Theorem, at least what percent of the observations lie within plus and minus 1.35 standard deviations of the mean? Group of answer choices 56% 45% 67% 100%
An entrepreneur faces many bureaucratic and legal hurdles when starting a new business. The World Bank collects information about starting businesses throughout the world. It has determined the time, in days, to complete all the procedures required to start a business. Data for 187 countries…
Suppose a system fails if and only if either events E1 or E2 occur but E3 does not occur. Find the probability of system failure if the events E1, E2, and E3 are independent of each other, E1 and E2 are mutually exclusive, and if P(E1) = 0.4, P(E2) = 0.35, and P(E3) = 0.1
please use R to answer the questions. present or attach relevant R outputs used to answer the questions
Open the data file DF2.11C (found in the LBRT #1 folder where you accessed this quiz). Using the data in the column headed "Amenities" to determine the value (to one decimal place) for each of the following: Accommodation…
For a standard normal distribution, find: P(0.45 < z < 2.43) (round to 3 decimal places)
Show that P(A△B) = P(A ∩ B) + P(B ∩ A). Hint: use the properties of set and probability measures.
The average monthly sales volume (in thousands of dollars) for a firm depends on the number of hours x of training of its sales staff, according to the following equation. (Give exact answers. Do not round.) S(x) = (5/x) + 60 + (x/5), 5 ≤ x ≤ 100 (a) Find lim x→5+ S(x). (thousand…
Initial public offerings' prospectuses were examined. In a random sample of 60 prospectuses in which sales forecasts were disclosed, the mean debt-to-equity ratio prior to the offering issue was 3.8, and the sample standard deviation was 5.14. For an independent random sample of 41 prospectuses…
Discuss 3 ways that we use statistics on a regular basis
Instructions: In an APA formatted Word document, complete the following: Use the attached dataset for our company to address the following. Task assignments to employees are supposed to be done at random. On a certain day, all the best jobs, in order of desirability, were given to the men. Is…
DATAfile: Corporate Bonds You may need to use the appropriate technology to answer this question. A sample containing years to maturity and (percent) yield for 40 corporate bonds is contained in the data file named CorporateBonds. A) Develop an estimated regression equation with years to…
A sample with 48 observations has a mean value of 3.0 and a sample standard deviation of 14.5. What would be the test statistic for the null hypothesis that the true population mean is zero? (Enter a positive number rounded to the nearest 0.1.
A sample of 500 shoppers was selected in a large metropolitan area to determine various information concerning consumer behavior. Among the questions asked was, "Do you enjoy shopping for clothing?" Of 240 males, 136 answered yes. Of 260 females, 224 answered yes. What are the critical values…
Using the workout method find out how many salespeople a company should hire based on following information :number of large accounts Large 20,000 , medium 30,000, small 50,000 number of visits made to these accounts per year 24, 18, and 12 respectively time spent on each account per visit 1…
A stem and leaf plot is the same as a boxplot. a part of a small tree. a picture of a distribution. useful for describing categorical variables.
As a new data scientist for a computer selling company, you have been asked to provide analytics for an important business initiative. Your data is well-sourced and readily available. You're ready to start digging in – only to discover that the data you were given doesn't match up well. The…
A research is conducted to study the relationship between the electricity power consumption per hour during the peak period and the monthly electricity power consumption. The electricity.csv dataset contains the data of hourly consumption during the peak period (Y) and the monthly consumption…
Suppose that a company's annual sales were $1,200,000 in 1999. The annual growth rate of sales from 1999 to 2000 was 16 percent, from 2000 to 2001 it was -5 percent, and from 2001 to 2002 it was 22 percent. The geometric mean growth rate of sales over this three-year period is calculated as…
Suppose you run a marketing firm that is hired by a car dealership. One of the variables of interest is the color of the car. Your firm interviewed 100 people and asked them to choose their favorite color from the list of ten colors offered by the manufacturer. Which of the three measures of…
The original DVD release of Dragon Ball Z in the United States contains 86 DVDs. (a) You like to watch the series before school every day. Suppose you watch a different DVD Monday through Friday. How many different viewing schedules (i.e., if you watch DVD 17 on Monday and DVD 5 on Thursday,…
What would be categorical data about COVID-19? And what would be numerical data about COVID-19? Please provide examples highlighting the main differences.
A food processor packages orange juice jars. The weights of the filled jars are approximately normally distributed with a mean of 10.5 ounces and a standard deviation of 0.3 ounces. Find the proportion of all jars packaged by the process that have weight that falls below 10.875 ounces
The test scores of 600 students are normally distributed with a mean of 76 and a standard deviation of 8. The instructor in the class had decreed that the top 15% of the students will be given a B+ on the test. What score is at the lower limit of the range which defines getting a B+? 2. The…
Construct a box plot from the given data. Scores on a Statistics Test: 83,73,89,77,62,87,55,72,65,76 Answer Keyboard Shortcuts Draw the box plot by selecting each of the five movable parts to the appropriate position. Construct a box plot from the given data. Scores on a Statistics…
Hi Please I would like to confirm my work on the question below: Gambling with an unfair die: An unfair die has unusual numbers on its six faces. If X = the outcome of one roll of the die, then the pmf is seen below. Suppose that every time you roll this die, you win a number of dollars equal…
For each data value, calculate the deviation from the mean. Data Value Deviations from the Mean 345 46 292 -7 334 35 276 -23 248 -51 (b) Verify that, except for the effect of rounding, the sum of the five deviations from the mean is equal to 0 for this data set. (If you rounded the sample…
Suppose that A and B are independent events such that the probability that neither occurs is a and the probability of B is b. Show that P(A) = 1 - b - a / 1 - b.
Which of the following assumptions is NOT made in LP models? Group of answer choices Integrality Divisibility Proportionality Certainty
Even as traditional markets for sweetgum lumber have declined, large section solid timbers traditionally used for construction bridges and mats have become increasingly scarce. The article "Development of Novel Industrial Laminated Planks from Sweetgum Lumber" (J. of Bridge Eng., 2008: 64–66)…
Let Xâ‚, Xâ‚‚, ..., Xâ‚™ be i.i.d. random variables with the PDF given by f(x) = 2x/θ², 0 < x < θ, θ > 0. (1) Find the PDF of Xâ‚™ = maxâ‚≤i≤n Xáµ¢. (2) Find the PDF of Xâ‚ = minâ‚≤i≤n Xáµ¢.
Compare the dispersion in study regions (x) and (y)? 1.The absolute and relative dispersions are similar for regions (x) and (y) 2.The absolute dispersion is higher for region (y); the relative dispersion is higher for region (x) 3.The absolute dispersion is similar for (x) and (y);…
Find the generating function G_X(t) = E(t^X) when X is a geometric random variable, i.e. for x in {1, 2, ...} it is given that P(X=x) = (1/2)^x.
Our math club has 20 members, 3 officers: President, Vice President, and Treasurer, and 17 workers: W1, W2, W3, ..., W17. However, one member, Ali, hates another member, Brenda. How many ways can we fill the officer slots and worker slots if Ali refuses to serve as an officer if Brenda is also…
You intend to estimate a population mean with a confidence interval. The population standard deviation is unknown. You believe the population to have a normal distribution. Your sample size is 48. Find the positive critical value that corresponds to a confidence level of 90%. (Round answer to…
List three fields that you would include for a database for a music store.
You are given the following (x,y) data: X 6 -5 1 -2 Y 2 1 0 -3 What is the value of the correlation coefficient, r? 0.43 0.21 0.13 0.85 1.28
Mr. Smith invests only a part of his wealth into a risky asset that has a positive return of 10% with probability 𜋠and has a negative return of -4% with probability 1 - ðœ‹. The risk-free rate is 1%. Mr. Smith's utility function is ð‘¢ = ln(ð‘¤), where 𑤠is his wealth. Which of the…
You wish to test the following claim (Ha) at a significance level of α=0.01. Ho: μ = 57.2 Ha: μ < 57.2 You believe the population is normally distributed, but you do not know the standard deviation. You obtain a sample of size n = 16 with mean xÌ„ = 48.7 and a standard deviation of SD =…
given: P(A) = 0.48 P(B) = 0.3 P(A ∪ B) = 0.57 (a) P(Ac) (b) P(Bc) (c) P(A ∩ B) (d) P((A ∪ B)c) (e) P(Ac ∪ B) (f) P(A ∩ Bc)
The years worked by a group of nurses and their monthly income in dollars are related by the following equation: y = 42.15x + 1158.1 If the line is a good predictor, indicate what salary a nurse who has been working for 5 years is expected to have. A/ ___________ Dollars. The years worked by…
1
...
291
292
293
294
295