Specify the population characteristics:

\(H_0: P_{1} - P_2 = \)
\(H_a: P_{a1} =\)		\(P_{a2} =\)

Specify the properties of the test:

Type of test	Two-tails Positive one-tail Negative one-tail
Type I error rate, \(\alpha =\)
Power=
Sample size for group 1, \(n_1=\)
Sample size for group 2, \(n_2=\)

Enter the population characteristics by entering the proportions for the null and alternative hypotheses. Select the type of test and the Type I error rate. Enter either a desired power value or sample sizes and click the corresponding button to either Calculate minimum sample sizes or Calculate power .