A required condition for using the normal approximation to the binomial in testing the difference between two population proportions is that n₁p₁ $\ge$ 30 and n₂p₂ $\ge$ 30.

Question

Quizplus · Accepted Answer

The correct condition is that both n1p1 and n1(1-p1) should be greater than or equal to 5, and similarly for n2p2 and n2(1-p2), to ensure the sample size is large enough for the normal approximation to be valid.

A Required Condition for Using the Normal Approximation to the Binomial