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In a recent study ,doctors have found that aspirin seems to prevent heart attcaks . The research project was based on 2000 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 attack ? 

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