N Z a2 Z v 2 p 1 1-p 1 p 2 1-p 2 p 1 -p 2 2 where Z a2 is the critical value of the Normal distribution at a2 eg. N m 1 m 1 N. N_Akappa n_B text and.
When you want to identify the sample size for a larger population one can use the following formula.
In order to estimate the sample size we need approximate values of p 1 and p 2. For Finite Sample Size. Lets make it look a little more friendly to the eyes. For a power of 80 v is 02 and the critical value is 084 and p 1 and p 2 are the expected sample proportions of the two groups.