SOLUTION: We wish to estimate the prevalence of asthma at a large school of 1700 children.� We think it will be around 15% and want a sample size that allows the 99% confidence limits to be

Question 751870: We wish to estimate the prevalence of asthma at a large school of 1700 children.� We think it will be around 15% and want a sample size that allows the 99% confidence limits to be within 5% of our final estimate.� TO THE NEAREST 10 CHILDREN�(no decimal places), what is the minimum sample size expected to achieve this?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
We wish to estimate the prevalence of asthma at a large school of 1700 children. We think it will be around 15% and want a sample size that allows the 99% confidence limits to be within 5% of our final estimate. TO THE NEAREST 10 CHILDREN (no decimal places), what is the minimum sample size expected to achieve this?
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n = [z/E]^2*pq
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n = [2.5758/0.05]^2*0.15*0.85 = 338
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Cheers,
Stan H.
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