When determining the pooled population variance estimate in a t test for independent means:
A)the variance of at least one of the original populations must be known (as opposed to estimated), but the other can be estimated from sample scores
B)the variance of BOTH of the original populations must be known, as opposed to estimated
C)the estimates based on each of the samples are averaged in such a way as to give more influence to the estimate based on more participants
D)the scores from both samples are combined to form a single sample, and the estimated variance is figured in the usual way, but using this combined sample

Question

Quizplus · Accepted Answer

The pooled population variance estimate in a t-test for independent means is calculated by averaging the variances of the two samples in a way that gives more weight to the sample with more participants. This approach accounts for the fact that larger samples provide more reliable estimates of the population variance.

When Determining the Pooled Population Variance Estimate in a T