Which of the following statements about matched-pairs sampling is correct?

A) It is a procedure that matches each unit from population A with a "twin" from population B so that any sample observation about a unit in population A automatically yields an associated observation about a unit in population B.
B) It is designed to control for extraneous factors that might influence the characteristic being measured in addition to the variable under study.
C) When testing the effectiveness of a new drug compared to a traditional one, each patient in an experimental group might be matched with a partner in a control group of the same age, weight, height, sex, occupation, medical history, lifestyle, and so on.
D) All of these.
E) None of these.

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Zybrea Knight · Accepted Answer

Final Answer : D, Explanation :  Matched-pairs sampling is a procedure that involves pairing units from two populations based on some criteria (such as age, sex, occupation, medical history, etc.) so that they are as similar as possible, and then randomly assigning one of each pair to a treatment group and the other to a control group. This ensures that any observed difference between the two groups is due to the treatment, rather than any extraneous factors that might influence the outcome. Therefore, all of the given statements about matched-pairs sampling are correct.

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