# You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 68%. You would like to be 95% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required?

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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 68%. You would like to be 95% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required?

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Step 1

Thus, it is given that the confidence level is 95%. Therefore, the significance level, α = 0.05.

From the EXCEL, using the formula, = NORM.INV(0.95,0,1), the c...

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### Hypothesis Testing 