In Order to Test the Effectiveness of a Drug Called

Multiple Choice

In order to test the effectiveness of a drug called XZR designed to reduce cholesterol levels,the cholesterol levels of 9 heart patients 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 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