a)
To state the null and alternative hypotheses.
a)
Answer to Problem 42PT4
Explanation of Solution
The null and alternative hypotheses:
Where, p1 is the proportion of women who were physical active. P2 is the proportion of women who were not physical active.
b)
To identify which inference method to be used.
b)
Answer to Problem 42PT4
Two-sample z-test.
Explanation of Solution
Given:
The null and alternative hypotheses:
In this test, we have to compare two population proportions. Therefore, here two-sample z-test is useful.
c)
To explain whether we generalize the results to all women aged 65 and older.
c)
Answer to Problem 42PT4
The study cannot be generalized.
Explanation of Solution
Given:
The null and alternative hypotheses:
The sample collected based on white women. Therefore, it is not a representative of all population. Hence, this result cannot be generalized to all women aged 65 and older.
d)
To explain confounding and give example of potential confounding.
d)
Answer to Problem 42PT4
The confounding variable is Mentally stimulating activities.
Explanation of Solution
Given:
The null and alternative hypotheses:
The two variables are said to be confounded when their effects on response variable cannot be distinguished from each other. The confounding variable is Mentally stimulating activities.
Chapter 12 Solutions
The Practice of Statistics for AP - 4th Edition
Additional Math Textbook Solutions
Elementary Statistics Using Excel (6th Edition)
Intro Stats, Books a la Carte Edition (5th Edition)
Elementary Statistics
Introductory Statistics
Fundamentals of Statistics (5th Edition)
- MATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons IncProbability and Statistics for Engineering and th...StatisticsISBN:9781305251809Author:Jay L. DevorePublisher:Cengage LearningStatistics for The Behavioral Sciences (MindTap C...StatisticsISBN:9781305504912Author:Frederick J Gravetter, Larry B. WallnauPublisher:Cengage Learning
- Elementary Statistics: Picturing the World (7th E...StatisticsISBN:9780134683416Author:Ron Larson, Betsy FarberPublisher:PEARSONThe Basic Practice of StatisticsStatisticsISBN:9781319042578Author:David S. Moore, William I. Notz, Michael A. FlignerPublisher:W. H. FreemanIntroduction to the Practice of StatisticsStatisticsISBN:9781319013387Author:David S. Moore, George P. McCabe, Bruce A. CraigPublisher:W. H. Freeman