If we want to perform a one-tail test for differences between two populations of nominal data with exactly two categories, we must employ the z-test of $p _ { 1 } - p _ { 2 }$ .

Question

Quizplus · Accepted Answer

The z-test for two proportions is appropriate for comparing differences between two populations with nominal data having two categories, especially when sample sizes are large enough to approximate normal distribution.

If We Want to Perform a One-Tail Test for Differences p1−p2p _ { 1 } - p _ { 2 }p1​−p2​

If We Want to Perform a One-Tail Test for Differences $p _ { 1 } - p _ { 2 }$