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Question: in a recent study doctors have found that aspirin seems...

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In a recent study, doctors have found that aspirin seems to prevent heart attacks. The research project was based on 2,000 people. Half took aspirin five times a week while the other half took a placebo on the same schedule. After three years, the researchers determined that 98 of those who took aspirin and 174 of those who took placebo had a heart attack. At the 5% level of significance, do these findings indicate that aspirin is effective at reducing heart attacks?

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