SOLUTION: A survey of 1084 men age 18 & older in 1998 for the Commonwealth Fund indicated that more than half did not have a physical exam or a blood cholesterol test in the past year. A me

Question 284157: A survey of 1084 men age 18 & older in 1998 for the Commonwealth Fund indicated that more than half did not have a physical exam or a blood cholesterol test in the past year. A medical researcher plans to sample men in her community randomly to see if similar results occur. How large a random sample would she need to estimate this proportion to within .05 with probability 0.95?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A survey of 1084 men age 18 & older in 1998 for the Commonwealth Fund indicated that more than half did not have a physical exam or a blood cholesterol test in the past year. A medical researcher plans to sample men in her community randomly to see if similar results occur. How large a random sample would she need to estimate this proportion to within .05 with probability 0.95?
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n = [z/E]^2(p-hat)(q-hat)
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n = [1.96/0.05]^2*(1/2)(1/2)
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n = 384.16
Round up to n = 385
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Cheers,
Stan H.
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