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

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 administering the drug is an example of testing the difference between:

Select one:

a. Two means from independent populations.

b. Matched pairs from two dependent populations.

c. Two population proportions.

d. Two population variances from independent populations.

math   Statistics-And-Probability   
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Answer #1

Correct option:

b. Matched pairs from two dependent populations

Explanation:
Here, the two samples:

Sample 1: heart patients' cholesterol levels before they are given the drug

Sample 2: heart patients' cholesterol levels after they are given the drug

are not independent. They are correlated pairs, because measurements are taken from the same set of 9 heart patients before and after the drug.

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