Formula In Finding Sample Size. Where z 1645 for a confidence level α of 90 p proportion expressed as a decimal e margin of error. Feb 26 2010 The formula does not cover finite population.
N 1645 2 05 1 -. Thus 186 sample size arrived at should be corrected adjusted for finite population. This equation is for an unknown population size or a very large population size.
May 01 2017 You can use the formula to calculate a sample size for a confidence level of 99 and margin of error -1 01 using the standard deviation suggestion of05.
In order to calculate the sample size yourself you will need to use this equation. Necessary Sample Size Z-score2 StdDev 1-StdDev margin of error2. If your population is smaller and known just use the sample size calculator. We now have the tools to calculate sample size.
