Formula For Finding Sample Size Complete Guide

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formula for finding sample size. Displaystyle frac Zsigma sqrt nW2 for n yielding the sample size. N z 2 p 1 - p e 2 where z 1645 for a confidence level a of 90 p proportion expressed as a decimal e margin of error.

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Z 1645 p 05 e 004. Thus 186 sample size arrived at should be corrected adjusted for finite population. If we are using three independent variables then a clear rule would be to have a minimum sample size of 30.

196 for 95 confidence level P population proportion expressed as decimal assumed to be 05 50 M Margin of Error at 5 005.

If the population is N then the corrected sample size should be 186N N185. The steps that follow are suitable for finding a sample size for continuous data ie. Nfrac 1000 11000005005 286 n 110000050051000 286 The survey therefore needs to include 286 employees. If N100 then the corrected sample size would be 18600285 6526 or 66.