You are testing the difference between two population means.The pooled standard deviation is only appropriate if the two populations
A)are normally distributed
B)have equal variances (standard deviations)
C)have equal means (averages)
D)are skewed
E)have equal sample sizes

Question

Quizplus · Accepted Answer

The pooled standard deviation is appropriate when the two populations have equal variances (standard deviations), as it assumes homogeneity of variance between the groups being compared.

You Are Testing the Difference Between Two Population Means