Question

Suppose that you are interested in investigating the association between retirement status and heart disease. One concern might be the age of the subjects: An older person is more likely to be retired, and also more likely to have heart disease. In one study, 127 victims of cardiac arrest were matched on a number of characteristics (that included age) with 127 healthy control subjects. Retirement status was then ascertained for each subject.

a) Test the null hypothesis that there is no association between retirement status and heart disease.

b) What do you conclude?

c) Estimate the odds ratio and the 95% confidence interval of being retired for healthy individuals versus those who have experienced cardiac arrest.

Healthy	Cardiac Arrest		Total
	Retired	Not Retired
Retired	27	12	39
Not Retired	20	68	88
Total	47	80	127

Answer 1