In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels,9 heart patients' cholesterol levels are measured before they are given the drug.The same 9 patients use XZR for two continuous months.After two months of continuous use,the 9 patients' cholesterol levels are measured again.The comparison of cholesterol levels before versus after administering the drug is an example of testing the difference between:
A)Two means from independent populations.
B)Two population variances from independent populations.
C)Two population proportions.
D)Matched pairs from two dependent populations.

Question

Quizplus · Accepted Answer

This scenario involves the same group of heart patients being measured before and after using the drug XZR. Therefore, it is a comparison of matched pairs from two dependent populations. The goal is to determine if the drug has had an effect on their cholesterol levels. Options A, B, and C do not apply to this scenario.

In Order to Test the Effectiveness of a Drug Called