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You want to obtain a sample to estimate a population proportion. At this point in time,...

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be 90% confident that you estimate is within 2.5% of the true population proportion. How large of a sample size is required?

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Solution= Given that E = 2.5% = 0.025 ê : 0.5 cuse 0.5) 1 - f 1-0.5 = 0.5 At go% confidence level of zis 1 - 90% 1 -0.90 0.1

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