In order to use the pooled sample variance when testing the difference in two population means,what must be assumed?
A)The sample means are unbiased estimates of the population means.
B)The population variances are equal.
C)The population means are equal.
D)The population variances are inversely proportional.
E)The sample means are unequal.

Question

Quizplus · Accepted Answer

The assumption that the population variances are equal is necessary for using the pooled sample variance when testing the difference in two population means. Without this assumption, the t-test statistic may not follow a t-distribution and the results of the hypothesis test may not be accurate.

In Order to Use the Pooled Sample Variance When Testing