HW Score: $20 \%, 3$ of 15 points
Question 1, 9.2.1 $\quad$ Points: 0 of 1
Determine whether the samples are independent or dependent.
To test the effectiveness of a drug, cholesterol levels are measured in 120 men before and after the treatment.
Choose the correct answer below.
A. The samples are independent because there is a natural pairing between the two samples.
B. The samples are dependent because there is a natural pairing between the two samples.
C. The samples are dependent because there is not a natural pairing between the two samples.
D. The samples are independent because there is not a natural pairing between the two samples.

Step 1 ：Determine whether the samples are independent or dependent. The problem states that to test the effectiveness of a drug, cholesterol levels are measured in 120 men before and after the treatment.

Step 2 ：Choose the correct answer from the following options: A. The samples are independent because there is a natural pairing between the two samples. B. The samples are dependent because there is a natural pairing between the two samples. C. The samples are dependent because there is not a natural pairing between the two samples. D. The samples are independent because there is not a natural pairing between the two samples.

Step 3 ：The correct answer is B. The samples are dependent because there is a natural pairing between the two samples. This is because the same men are measured before and after the treatment, creating a natural pairing.

Step 4 ：\(\boxed{\text{The correct answer is B. The samples are dependent because there is a natural pairing between the two samples.}}\)