SOLUTION: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=13%. You would like t

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Question 1076549: You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately
p∗=13%. You would like to be 90% confident that your esimate is within 0.2% of the true population proportion. How large of a sample size is required?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately
p∗=13%. You would like to be 90% confident that your estimate is within 0.2% of the true population proportion. How large of a sample size is required? Si
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Since E = z*sqrt[p*q/n]
n = [z/E]^2*p*q
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Ans: n = [1.645/0.02]^2*0.13*0.87 = 766 when rounded up
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Cheers,
Stan H.
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