An investigator wants to design a study to estimate the difference in the propor

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An investigator wants to design a study to estimate the difference in the proportions of men and women who develop early onset cardiovascular disease(defined as cardiovasculare disease before age 50) A study conducted 10 years ago found that 15% and 8% of men and women respectively developed early onset cardiovascular disease. How many men and women are needed to generate a 95% CI estimate for the difference inproportions with a margin of error not exceeding 4%> ( Is the formula for this problem Margin of error?)

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