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High levels of cholesterol in the blood are associated with higher risk of heart attacks. Will...

High levels of cholesterol in the blood are associated with higher risk of heart attacks. Will using a drug to lower blood cholesterol reduce heart attacks? The Helsinki Heart Study looked at this question. Middle-aged men were assigned at random to one of two treatments: 2051 men took the drug gemfibrozil to reduce their blood cholesterol levels, and a control group of 2030 men took a placebo. During the next five years, 65 men in the gemfibrozil group and 84 men in the placebo group had heart attacks. Is there a significant difference between the heart attack rate of those who took gemfibrozil and the rate of those who received the placebo?

a. Calculate the value of the two tail z test for two proportions. Round your answer to 2 decimal points.

b. Find the lower bound of 99% CI for the difference in two proportions.

c. Calculate the upper bound of 99% CI for the difference of the two proportions.

Math   Statistics-And-Probability   
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