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)paired difference experiment.
E)matched pairs from two independent populations.

Question

Quizplus · Accepted Answer

This scenario describes a paired difference experiment because the cholesterol levels of the same 9 patients are measured before and after the treatment, making it a comparison within the same group over two different times.

In Order to Test the Effectiveness of a Drug Called