Aspirin and heart attacks, I Can aspirin help prevent

Chapter 6, Problem 6.7

(choose chapter or problem)

Aspirin and heart attacks, I Can aspirin help prevent heart attacks? Th e Physicians Health Study, a large medical experiment involving 22,071 male physicians, attempted to answer this question. One randomly selected group of 11,037 physicians took an aspirin every second day, while the rest took a placebo. Aft er several years the study found that subjects in the aspirin group had signifi cantly fewer heart attacks than subjects in the placebo group. (a) Identify the subjects, the explanatory variable and the values it can take, and the response variable. (b) Use a diagram like the one in Figure 6.2 or Figure 6.3 to outline the design of the Physicians Health Study. (When you outline the design of an experiment, be sure to indicate the size of the treatment groups and the response variable.)