Concept explainers
To find: the most suitable inference procedure for answering the original research question.
Answer to Problem 9PT
Two-sample z interval for a proportion difference
Explanation of Solution
Generally
One proportion: for one-sample z test/interval
Two proportions: for two-sample z test/interval
One mean: for one sample t test/interval
Two means: for two-sample t test/ interval or paired t test/interval
Use a test if want to test for a difference, equality, decrease or increase, use an interval if want to calculate an interval in which the true value comes.
For two-sample z interval for a proportion difference is
Because here interested in the calculation of the difference of the proportions.
Hence, the correct option is (b)
Chapter 10 Solutions
The Practice of Statistics for AP - 4th Edition
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