In testing the difference between the means of two independent populations,the variances of the two samples can be pooled if the population variances are assumed to be ____________.
A)Unequal
B)Greater than the mean
C)Sum to 1
D)Equal

Question

Quizplus · Accepted Answer

The variances of the two populations can only be pooled if they are assumed to be equal. If they are unequal, we cannot make assumptions about the common variance, and therefore cannot pool the variances.

In Testing the Difference Between the Means of Two Independent