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08-11-2022
Mathematics

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a medical study was looking into the question if using a drug to reduce blood cholesterol level will decrease the risk of a heart attack. middle age men were randomly assigned to two groups. one group of 2051 men took a drug that reduces cholesterol level, and the second group (control) of 2030 men took a placebo. during the next five years, 56 men from the treatment group and 84 men from the control group had heart attacks. was the drug treatment effective? use 5% significance level

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