# The population mean proportion is .80. We decide to sample the population by randomly selecting 40 items

## Question:

The population mean proportion is .80. We decide to sample the population by randomly selecting 40 items and computing sample proportions.

a. Can we use the normal distribution to approximate the distribution of sample proportions? Why?

b. What is the standard error of this distribution?

c. Applying the empirical rule, approximately 95% of sample proportions are between what values?

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**Related Book For**

## Statistical Techniques In Business And Economics

**ISBN:** 9781265779696

19th Edition

**Authors:** Douglas Lind, William Marchal, Samuel Wathen