Concept explainers
To find: the best answer on the basis of given information.
Answer to Problem 68E
Explanation of Solution
Generally
One proportion: check with one-sample z test/ interval
Two proportions or proportion difference: for two-sample z test/interval
One mean: for one-sample t test/interval
Two means or mean difference: for two-sample t test/ interval
Two means or mean difference with paired data in the two samples: for paired t test/interval
Using a test when needs to test for a difference, equality, increase or decrease. Using an interval when needs to calculate an interval in which the true value lies.
This is since the two methods are performed to the same random sample
Hence, the correct option is (a)
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