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{"ops":[{"insert":"An experiment determined that taking aspirin daily reduces one's probability of suffering a heart attack. The research project, which was scheduled to last for 5 years, involved 22,000 American physicians (all male). Half took an aspirin tablet three times per week, while the other half took a placebo on the same schedule. The study was conducted in 1982, and at that time, the mean age of the physicians was 50. In the years following the experiment, the physicians were monitored for other medical conditions. One of these was the incidence of cataracts. There were 1,084 cataracts in the aspirin group and 997 in the placebo group. Do these statistics allow researchers to conclude that aspirin leads to more cataracts?\n"}]}
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