You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p ∗ = 76 % . 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?
Added by Kenia R.
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So, p* = 0.76 and the margin of error (E) is 0.025. The formula to calculate the sample size (n) for a proportion is: n = [Z^2 * p*(1 - p*)] / E^2 Where Z is the Z-value from the standard normal distribution corresponding to the desired confidence level. For a Show more…
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