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 = [(zvalue)^2 * p * q]/E^2
... where n = sample size, zvalue is found using a ztable 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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