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Kennedy O'Quinn

Kennedy O.

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A simple random sample of size 100 is taken from a population with unknown standard deviation. A normal probability plot of the data displays significant curvature but no outliers. Can you reasonably apply the $t$ -interval procedure? Explain your answer.

A simple random sample of size 100 is taken from a population with unknown standard deviation. A normal probability plot of the data displays significant curvature but no outliers. Can you reasonably apply the $t$ -interval procedure? Explain your answer.

Introductory Statistics

Confidence Intervals for One Populationā€¦

Confidence Intervals for One Populationā€¦

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ANSWERED

Audrey Fong verified

Numerade educator

Data is gathered for a group of men and women on the first vehicle that they owned. Answer options are "car", "truck", or "none". The data is summarized on "first vehicle owned" and "gender" as follows: men (M) women (W) car (C) 50 34 truck (T) 35 17 none (N) 27 28 One person is chosen at random and asked about the first vehicle owned. Find the follow probabilities as reduced fractions. a. Find P (not N), the probability that the answer is not "none". b. Find P (T or M), the probability that the answer is "truck" or the person's gender is "men". c. Find P (W or C), the probability that the person's gender is "women" and she answered "car".

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Audrey Fong verified

Numerade educator

If two balanced die are rolled, the possible outcomes can be represented as follows. Determine the probability that the sum of the dice is 6 or 10. Give answer in reduced fraction.

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Jacob Fry verified

Numerade educator

The accompanying contingency table shows the popular votes cast in the 1984 presidential election classified by region and political party. Data are in thousands, rounded to the nearest thousand. What percentage of those who voted "Other" were in the West? Demo Republican Other Total Northeast 9046 11,336 101 20,483 Midwest 10,511 14,761 169 25,441 South 10,998 17,699 136 28,833 West 7022 10,659 214 17,895 Total 37,577 54,455 620 92,652

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ANSWERED

Audrey Fong verified

Numerade educator

Data for the number of hours needed by sixth grade students to complete a research project is in the table below. Hours: Number of Students: 4 22 5 20 6 30 7 9 8 10 9 7 10+ 6 A student is selected at random. The events A, B, and C are defined as follows. A = the event the student took between 6 and 9 hours inclusive. B = the event the student took at most 7 hours C = the event the student took at least 7 hours Determine each probability. Round values to three places past the decimal. a. P (A or B) = b. P (not C) = c. P (A & C) = d. Determine whether events B and C are mutually exclusive.

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Sanchit Jain verified

Numerade educator

a. Find the z-value on the standard normal curve that has area 0.0752 to its left. b. Find the value of z0.41-.

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Sanchit Jain verified

Numerade educator

In one city, 52.9% of adults are female, 8.4% of adults are left-handed, and 5.1% are left-handed females. For an adult selected at random from the city, let F = event the person is female L = event the person is left-handed. Find P (F or L).

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Areen Dabadghav verified

Numerade educator

A company that produces cartons of cereal took a random sample of size 45 to verify whether or not the mean weight of cartons is 700 grams. The sample yielded a test statistic of t=1.803. a. Classify this hypothesis test as right-tailed, left-tailed, or two-tailed. b. Identify the degree of freedom. c. Use the t-table to estimate the P-value associated with this situation.

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Sanchit Jain verified

Numerade educator

A meteorological office keeps records of the annual precipitation in different cities. For one city, the mean annual precipitation is 31.9 and the standard deviation of the annual precipitation amounts is 4.1. Let x represent the annual precipitation in that city. (a) Determine the z-score for an annual precipitation in that city of 25.6 inches. Round to two decimal places. (b) Interpret the z-score found in part (a) in terms of the given situation

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ANSWERED

Audrey Fong verified

Numerade educator

A study is conducted on the correlation between petal width and petal length of a flower species. The regression line is calculated to be y = 1.687x + 1.564 where x represents the petal width in centimeters and y represents the petal length in centimeters. Predict the petal length of a flower of this species that has a petal width of 1.24 centimeters. Round answer to three places past the decimal.

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Qudsiya Anis verified

Numerade educator

In a poll of 41,000 randomly selected college students who live in residence halls, 73% answered "yes" when asked "Do you have a television in your residence hall room?" a. Identify the sample in this situation. b. Identify the population in this situation.

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