Posted by cm on Tuesday, May 8, 2012 at 8:21pm.
A researcher wishes to be 95% confident that her estimate of the population proportion of individuals who travel overseas is within 4% of the true proportion. Find the sample size necessary. In a prior study, a sample of 200 people showed that 80 traveled overseas last year.

statistics  please help  MathGuru, Thursday, May 10, 2012 at 7:38pm
Formula to find sample size:
n = [(zvalue)^2 * p * q]/E^2
... where n = sample size, zvalue is found using a ztable for 95% confidence (which will be 1.96), p = 80/200, q = 1  p, ^2 means squared, * means to multiply, and E = .04
Convert all fractions to decimals, then plug values into the formula and calculate n.
I hope this will help get you started.
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