Does regular exercise reduce the risk of a heart attack? Here are two ways to st

Question

Does regular exercise reduce the risk of a heart attack? Here are two ways to study this question. 1. A researcher finds 2000 men over 40 who exercise regularly and have not had heart attacks. She matches each with a similar man who does not exercise regularly, and she follows both groups for 5 years. 2. Another researcher finds 4000 men over 40 who have not had heart attacks and are willing to participate in a study. She assigns 2000 of the men to a regular program of supervised exercise. The other 20 continue their usual habits. The researcher follows both groups for 5 years. Explain clearly why the second design will produce more trustworthy data.

Explanation / Answer

First design is only observational study. Here, researcher observes subjects and measure variables of interest without assigning treatment to the subjects.

Scond design is experimental study. Here, researcher applies treatments to experimental units and then proceed to observe the effect of the treatent on the experimental units.

Experimental study will produce more trustworthy data.

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.