When constructing a confidence interval for the difference in two population means, it is appropriate to use the pooled standard error only when
A) the population standard deviations can be assumed to be equal.
B) the sample standard deviations are exactly equal.
C) the population means can be assumed to be equal.
D) the sample means are exactly equal.

Question

Quizplus · Accepted Answer

The pooled standard error is appropriate when the population standard deviations can be assumed to be equal, as it combines the standard deviations of two samples into a single measure, assuming homogeneity of variance.

When Constructing a Confidence Interval for the Difference in Two