Equation To Determine Sample Size. NH n ie. Necessary Sample Size Z-score2 StdDev 1-StdDev margin of error2.
Where n is the sample size N is the population size and e is the level of precision. Necessary Sample Size Z-score2 StdDev1-StdDev margin of error2 Here is how the math works assuming you chose a 95 confidence level 5 standard deviation and a margin of error confidence interval of - 5. In order to calculate the sample size yourself you will need to use this equation.
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Yamane 1967886 provides a simplified formula to calculate sample sizes. Finally you can use these values to calculate the sample size that you will need. Thus 186 sample size arrived at should be corrected adjusted for finite population. 1645 for 90 confidence level P population proportion expressed as decimal assumed to be 05 50 M Margin of Error at 5 005.
