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You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.4.

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You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.4. You would like to be 95% confident that your esimate is within 2.5%% of the true population proportion. How large of a sample size is required? n =

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