When statisticians describe pooling the variances, they mean:
A) adding the standard deviations of the two samples.
B) adding the variances of the two samples.
C) taking the average of the two variances, accounting for sample size.
D) taking the average of the two variances, disregarding sample size.

Question

Quizplus · Accepted Answer

Pooling the variances involves taking the average of the two variances, but it accounts for the sample sizes. This is because the variances of larger samples should have more weight than those of smaller samples in the pooled variance calculation.

When Statisticians Describe Pooling the Variances, They Mean