SOLUTION: a researcher wishes to be 99% confident that her estimate of the true proportions of individuals who travel overseas is within 4% ofthe true population. find the sample size necess

Question 923760: a researcher wishes to be 99% confident that her estimate of the true proportions of individuals who travel overseas is within 4% ofthe true population. find the sample size necessary if in a prior study, a sample of 200 showed that 40 traveled overseas last year. If no estimate of the sample proportion is available, how large should the sample be?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a researcher wishes to be 99% confident that her estimate of the true proportions of individuals who travel overseas is within 4% ofthe true population. find the sample size necessary if in a prior study, a sample of 200 showed that 40 traveled overseas last year. If no estimate of the sample proportion is available, how large should the sample be?
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n = [z/E]^2*pq
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n = [2.5758/0.04]^2*((40/200)(160/200)] = 664 when rounded up
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Cheers,
Stan H.
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