Intro Stats, Books a la Carte Edition (5th Edition)
5th Edition
ISBN: 9780134210285
Author: Richard D. De Veaux, Paul Velleman, David E. Bock
Publisher: PEARSON
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Chapter CR, Problem 12E
But maybe the BMIs of all the participants changed during the four-week period. We can calculate the change in BMI for each participant in the study, and then compare the
Which of these inference methods would you use to tell whether informing the maids made a difference in their BMIs?
- a) See if the boxes in the boxplot overlap. The difference is significant if they don’t.
- b) Find a confidence interval for the paired changes in BMI for each group. If the confidence intervals don’t overlap, then they are different.
- c) Perform a two-sample t-test comparing whether the mean changes for the two groups are equal.
- d) Use a χ2 test of homogeneity.
- e) Use a two-sample z-test for the proportions that gained weight in each group.
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9.2 Testing the Mean mu:
Problem 3
(1 point)
Test the claim that the population of sophomore college
students has a mean grade point average greater than 2.2.
Sample statistics include n = 71, x = 2.44, and s = 0.9.
Use a significance level of a = 0.01.
The test statistic is
The P-Value is between :
The final conclusion is
< P-value <
A. There is sufficient evidence to support the claim that
the mean grade point average is greater than 2.2.
○ B. There is not sufficient evidence to support the claim
that the mean grade point average is greater than 2.2.
Note: You can earn partial credit on this problem.
Note: You are in the Reduced Scoring Period. All work counts for
50% of the original.
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Chapter CR Solutions
Intro Stats, Books a la Carte Edition (5th Edition)
Ch. CR - Speed and density The following data relate...Ch. CR - Hospital variables A random sample of 1000...Ch. CR - Lake source cooling Since 2000, Cornell University...Ch. CR - Life expectancy and literacy Consider the...Ch. CR - Hotel maids A Harvard psychologist recruited 75...Ch. CR - Now lets consider only the maids who were...Ch. CR - Prob. 10ECh. CR - Prob. 11ECh. CR - But maybe the BMIs of all the participants changed...Ch. CR - For each of the following descriptions, select the...
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