Equation To Determine Sample Size. In order to estimate the sample size we need approximate values of p 1 and p 2. Necessary Sample Size Z-score2 StdDev 1-StdDev margin of error2.
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For SEM however determining sample size is not as straightforward. Necessary sample size Z-score2 standard deviation 1 - standard deviation margin of error2. Thus 186 sample size arrived at should be corrected adjusted for finite population.
Here is an example of how the math works assuming you chose a 90 confidence level 6 standard deviation and a margin of error confidence interval of - 4.
In order to estimate the sample size we need approximate values of p 1 and p 2. Typically if there are H such sub-samples from H different strata then each of them will have a sample size nh h 1 2 H. X p x 1-pM. 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.
