The pooled estimate for the common variance, is the weighted average of the two sample variances, where the weights are determined by:
A) the sample standard deviations.
B) the sample variances.
C) the sample sizes.
D) the sample means.

Question

The pooled estimate for the common variance,  is the weighted average of the two sample variances, where the weights are determined by:
A) the sample standard deviations. 
B) the sample variances. 
C) the sample sizes. 
D) the sample means.

Quizplus · Accepted Answer

The weights for the pooled estimate are determined by the sample sizes. This is because larger sample sizes provide more precise estimates of the population variance, and therefore have a greater influence on the pooled estimate. Thus, option C is the correct choice.

The Pooled Estimate for the Common Variance, Is the Weighted