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 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

The comparison of cholesterol levels before and after the administration of the drug involves measuring the same variable twice on the same individuals. Therefore, this is an example of paired samples where the two sets of measurements are dependent on each other. Options A, B, and D are not suitable because they involve different types of sample comparisons. Option A (equal variances) and option D (unequal variances) both refer to the assumption about the variances in the populations being compared, which is not relevant in this case. Option B (independent samples) involves comparing two different groups of individuals, which is not the case here.

In Order to Test the Effectiveness of a Drug Called