For testing the difference between two population proportions, under what circumstances should the pooled proportion estimate be used to compute the value of the test statistic?
A) when the populations are normally distributed
B) when the sample sizes are small
C) when the samples are independently drawn from the populations
D) when the null hypothesis states that the two population proportions are equal

Question

Quizplus · Accepted Answer

The pooled proportion estimate should be used when the null hypothesis states that the two population proportions are equal. This assumption allows us to combine the sample proportions to estimate a common population proportion. If the null hypothesis does not assume equal population proportions, then the separate sample proportions should be used in the calculation of the test statistic.

For Testing the Difference Between Two Population Proportions, Under What