When testing the difference between two population means, the sample variances are pooled to estimate the population variance when ________________.
A) The population variances are known and equal
B) The population means are known
C) The population variances are assumed unequal and unknown
D) The population variances are assumed equal but unknown

Question

Quizplus · Accepted Answer

When testing the difference between two population means, the sample variances are pooled to estimate the population variance only when the population variances are assumed to be equal but unknown.

When Testing the Difference Between Two Population Means, the Sample