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 vs.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 is an example of matched pairs or paired samples as the same group of patients are being measured before and after the administration of the drug. Therefore, we are comparing the means of the same group (dependent population) before and after the administration of the drug XZR.

In Order to Test the Effectiveness of a Drug Called