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 the administration of the drug is an example of testing the difference between two ____________.
A)Samples of equal variances
B)Independent samples
C)Paired samples
D)Samples of unequal variances

Question

Quizplus · Accepted Answer

Paired samples are used when the same individuals are tested twice under different conditions, such as before and after the administration of a drug. This is the case in the given scenario, where the same 9 heart patients' cholesterol levels are measured before and after taking the drug XZR. Therefore, the comparison of cholesterol levels before versus after the administration of the drug is an example of testing the difference between two paired samples. Options A, B, and D are not appropriate in this case.

In Order to Test the Effectiveness of a Drug Called