# Sampling distribution of a proportion

Suppose a population proportion is .40, and 80% of the time when you draw a random sample from this population you get a sample proportion of .35 or more. How large a sample were you taking?

Please provide answer via excel.

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#### Solution Preview

I have attached a Word document and an Excel sheet. The Word document shows the steps to the solution with explanations. The excel sheet shows the standard normal percentile calculation and the sample size calculation.

Sampling

Suppose a population proportion is .40, and 80% of the time when you draw a ...

#### Solution Summary

In this solution, the sampling distribution of a sample proportion is used to calculate a sample size.

$2.19