Does regular exercise reduce bone loss in postmenopausal women? Here are two ways to study this question.
• A researcher finds 1000 postmenopausal women who exercise regularly. She matches each with a similar postmenopausal woman who does not exercise regularly, and she follows both groups for 5 years.
• Another researcher finds 2000 postmenopausal women who are willing to participate in a study. She assigns 1000 of the women to a regular program of supervised exercise. The other 1000 continue their usual habits. The researcher follows both groups for 5 years.
A.
Only the second study will produce trustworthy data.
B.
Both of the studies will produce trustworthy data.
C.
Only the first study will produce trustworthy data.
D.
Neither of the studies will produce trustworthy data.
Answer: B.
Both of the studies will produce trustworthy data.
• A researcher finds 1000 postmenopausal women who exercise regularly. She matches each with a similar postmenopausal woman who does not exercise regularly, and she follows both groups for 5 years.
• Another researcher finds 2000 postmenopausal women who are willing to participate in a study. She assigns 1000 of the women to a regular program of supervised exercise. The other 1000 continue their usual habits. The researcher follows both groups for 5 years.
Which of the following statements is correct with reference to the two studies?
A.
Only the second study will produce trustworthy data.
B.
Both of the studies will produce trustworthy data.
C.
Only the first study will produce trustworthy data.
D.
Neither of the studies will produce trustworthy data.
Answer: B.
Both of the studies will produce trustworthy data.
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