If we are testing the difference between two population proportions,it is assumed that the two populations are approximately normal and have equal variances.

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When testing the difference between two population proportions, it is not necessary to assume that the populations are approximately normal or have equal variances. The normality assumption is only necessary when testing the difference between two population means. Additionally, when testing the difference between two population proportions, it is common to assume that the sample sizes are large enough such that the normal approximation to the binomial distribution can be used. The assumption of equal variances is also not necessary since proportions are not measured in units with variances.

If We Are Testing the Difference Between Two Population Proportions,it