Specify the population characteristics:

\(H_0: P_1 - P_2=\)
\(H_a: \) Enter the proportions for the disagreement cells of the contingency table for the alternative hypothesis.
Has Trait 2? No Yes Has Trait 1? Yes \(A/n=\) \(B/n=\) NA No \(C/n=\) NA \(D/n=\)
\(H_a: P_{a1} - P_{a2}=\)

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, \(n=\)

Enter the population characteristics by entering the difference of dependent proportions for the null hypothesis. For the alternative hypothesis enter the proportions for the disagreement cells of the contingency table. Double check the alternative hypothesis statement under the contingency table to be sure they proportions reflect your intended values.

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.