Posted by **liz** on Monday, July 28, 2014 at 1:34am.

A researcher wishes to estimate the proportion of adults living in rural areas who own a gun. He wishes to achieve a margin of error of 2.8%. What is the minimum sample size needed?

- statistics -
**MathGuru**, Monday, July 28, 2014 at 6:27pm
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 whatever confidence level is used, when no value is stated in the problem p = .50, q = 1 - p, ^2 means squared, * means to multiply, and E = .028.

Plug values into the formula and calculate n.

I hope this will help.

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