If we are testing for the difference between two population proportions,it is assumed that the two samples are large enough that the binomial distribution can be approximated by the normal distribution.

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Quizplus · Accepted Answer

When testing for the difference between two population proportions, if the sample sizes are sufficiently large (np ≥ 10 and n(1-p) ≥ 10 for both samples), then the binomial distribution can be approximated by the normal distribution. This assumption is necessary for using the z-test to compare proportions.

If We Are Testing for the Difference Between Two Population