Posted by Tom on Saturday, March 13, 2010 at 9:25pm.
Determine the sample size necessary to estimate a population proportion to within .03 with 90% confidence assuming you have no knowledge of the approximate value of the sample proportion.

Statistics  MathGuru, Monday, March 15, 2010 at 6:58pm
Try this formula:
n = [(zvalue)^2 * p * q]/E^2
Note: n = sample size needed; .5 for p and .5 for q are used if no value is stated in the problem. E = maximum error, which is .03 in the problem. Zvalue is found using a ztable to represent 90% interval. Round final result to next highest whole number.
Also: ^2 means squared and * means to multiply.
I hope this will help get you started.

Statistics  mia, Monday, February 13, 2012 at 8:31pm
n = [(zvalue)^2 * p * q]/E^2
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