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

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The z-test for two proportions is used to determine if there is a significant difference between the proportions of two groups, which is applicable for nominal data with two categories.

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 $p _ { 1 } - p _ { 2 }$