Exercise and heart attacks. Does regular exercise reduce the risk of a heartattack? Here
Chapter 0, Problem 9.9(choose chapter or problem)
Exercise and heart attacks. Does regular exercise reduce the risk of a heartattack? Here are two ways to study this question. Explain clearly why the seconddesign will produce more trustworthy data.1. A researcher finds 2000 men over 40 who exercise regularly and have not hadheart attacks. She matches each with a similar man who does not exerciseregularly, and she follows both groups for 5 years.2. Another researcher finds 4000 men over 40 who have not had heart attacksand are willing to participate in a study. She assigns 2000 of the men to aregular program of supervised exercise. The other 2000 continue their usualhabits. The researcher follows both groups for 5 years.
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