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Meher G

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Meher's Quick Ask Videos

07:35
Intro Stats / AP Statistics

A Bernoulli experiment with success probability p is to be conducted.

1. What is the probability of getting k consecutive successes?
2. What is the probability of getting k consecutive successes and one failure like {SS...SF}?
3. Consider k successes have already occurred in this experiment. What is the probability that the next event is a failure?
4. Consider this experiment consists of n trials. What is the probability that k of them are successes?
5. Consider this experiment consists of n trials. What is the probability that the number of successes is less than or equal to c?

Values are p = 0.55, k = 3, n = 14, c = 5
06:41
Intro Stats / AP Statistics

Suppose the life of a particular brand of calculator battery is
approximately normally distributed with a mean of 80 hours and a
standard deviation of 11 hours. Complete parts a through c.
a. What is the probability that a single battery randomly
selected from the population will have a life between 75 and 85
hours? (Round to four decimal places as needed.)
b. What is the probability that 9 randomly sampled batteries
from the population will have a sample mean life of between 75 and
85 hours? (Round to four decimal places as needed.)
c. If the manufacturer of the battery is able to reduce the
standard deviation of battery life from 11 to 10 hours, what would
be the probability that 9 batteries randomly sampled from the
population will have a sample mean life of between 75 and 85
hours? (Round to four decimal places as needed.)
05:34
Intro Stats / AP Statistics

The one-time fling! Have you ever purchased an article of clothing (dress, sports jacket, etc.), worn the item once to a party, and then returned the purchase? This is called a one-time fling. About 10% of all adults deliberately do a one-time fling and feel no guilt about it! In a group of six adult friends, what is the probability of the following? (Round your answers to three decimal places.)

(a) no one has done a one-time fling
(b) at least one person has done a one-time fling
(c) no more than two people have done a one-time fling
02:41
Intro Stats / AP Statistics

Compute the sum of the squared deviation scores for the
following SAMPLE of scores, rounding to two decimal places:
5, 1, 8, 6
Compute variance for the following SAMPLE of scores, rounding to
two decimal places: 5, 1, 8, 6
Compute the standard deviation for the following SAMPLE of
scores, rounding to two decimal places: 5, 1, 8,
6
00:43
Intro Stats / AP Statistics

Abby Kratz, a market specialist at the market research firm of Saez, Sikes, and Spitz, is analyzing household budget data collected by her firm. Abby's dependent variable is monthly household expenditures on groceries (in $), and her independent variable is annual household income (in $1,000). Regression analysis of the data yielded the following tables:

Coefficients
Standard Error
t Statistic
p-value
Intercept
3.996
1.161268
3.441065
0.004885
x
0.358
0.102397
3.496205
0.004413

Source
df
SS
MS
F
Regression
1
9.858769
9.858769
12.22345
Se = 0.898
Residual
11
8.872
0.806545
r2 = 0.526341
Total
12
18.73077

Abby's sample size (n) is __________.
11
12
20
10
8
01:16
Intro Stats / AP Statistics

a. The variable being predicted is called the dependent variable and is denoted by y.
b. The variables being used to predict the value of the dependent variable are called the independent variables and are denoted by x.
c. Managerial decisions often are based on the relationship between two or more variables.
d. Regression analysis involving two or more independent variables is called multiple regression.
e. Regression analysis can be used to develop an equation showing how the variables are related.
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