STUDY A: A medical researcher finds 2000 men over 40 who have had heart attacks.

Question

STUDY A: A medical researcher finds 2000 men over 40 who have had heart attacks. She also finds 2000 men over 40 who have not had a heart attack. She asks each man in each group whether they exercised regularly as part of his usual lifestyle. STUDY B: 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 2000 continue their usual habits. The researcher follows both groups for three years. a) Name the explanatory and response variables in this study. b) What is the population of interest in this study? c) What type of study design is used in each of Study A and Study B?

Explanation / Answer

In part A, the reponse variable is whether the men is either herat attact or not and the the expalanatory variable also whether they exercised regularly or not. The interest of the analysis is that to test whether the exercise is affected to the  heart attacks or not. In part A we can test the association between the heart attack and exrcise using Chi-square test (contingency table).

In part B, here researcher want to test whether the regular program of supervised exercise is significantly different to control the heart attack than the usual habit. Here, the response variable is whether the men is hear attack or not and the response variable is whether regular program of supervised exercise is done or not. It can test using the two sample t-test in the proportion of heart attack between the excercise and non-excercise group.

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