Aspirin and heart attacks. Can aspirin help prevent heart attacks? The Physicians\' Health Study, a large medical experiment involving 22,000 male physicians, attempted to answer this question. One group of about 11,000 physicians took an aspirin every second day, while the rest took a placebo. After several years the study found that subjects in the aspirin group had significantly fewer heart attacks than subjects in the placebo group. Identify the experimental subjects, the explanatory variable and the values it can take, and the response variable. Use a diagram 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. The diagrams in Figures 5.2 (page 97) and { (page 98) are models.) What do you think the term \"significantly\" means in \"significantly fewer heart attacks\"?
a)Experimental subjects are the people who are divided among two, explanatory variables are the people having heart attack with or without aspirin, response variable will be people havinf heart attack among the aspirin anong th aspirin group and same thing happens in the placebo group.
b)
no heart attack
c)significantly fewer heart attack mean in this that im comparison with the placebo the heart attack in aspirin group is very very less.
| | | | | | | | |
| | | | Experment | | | |
| | | Aspirin | | Placebo | | | |
| heart attack | no heart attack | heart attack | no heart attack |
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