Posted by **Elizabeth** on Thursday, July 17, 2014 at 2:46pm.

A researcher would like to estimate the population proportion of adults living in a certain town who have at least a high school education. No information is available about its value. How large a sample size is needed to estimate it to within 0.19 with 99% confidence?

n=

(Round up to the nearest integer)

- Introduction to statistics -
**MathGuru**, Friday, July 18, 2014 at 7:09pm
Formula to find sample size:

n = [(z-value)^2 * p * q]/E^2

... where n = sample size, z-value is found using a z-table for 99% confidence, p = .50 (when no value is stated in the problem), q = 1 - p, ^2 means squared, * means to multiply, and E = 0.19.

Plug values into the formula and calculate n.

I hope this will help get you started.

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