Q1-A statistical analysis that combines information from several studies is

called a meta analysis. A meta analysis compared aspirin with placebo on

incidence of heart attack and of stroke, separately for men and for women

(J. Am. Med. Assoc., 295: 306-313, 2006). For the Women's Health Study,

heart attacks were reported for 198 of 19,934 taking aspirin and for 193 of

19,942 taking placebo

a- Construct the 2 2 table that cross classifies the treatment (aspirin,

placebo) with whether a heart attack was reported (yes, no).

b-Find a 95% confidence interval for the population odds ratio for women.

Interpret. (As of 2006, results suggested that for women, aspirin was helpful

for reducing risk of stroke but not necessarily risk of heart attack.)

(Construct a 90% confidence interval for the difference of proportions, and Interpret)