The quantity $s _ { j } ^ { 2 }$ is called the pooled variance estimate of the common variance of two unknown but equal population variances. It is the weighted average of the two sample variances, where the weights represent the:
A)sample variances.
B)sample standard deviations.
C)degrees of freedom for each sample.
D)None of these choices.

Question

Quizplus · Accepted Answer

The pooled variance estimate uses the degrees of freedom for each sample as weights to calculate the weighted average of the two sample variances.

The Quantity sj2s _ { j } ^ { 2 }sj2​

The Quantity $s _ { j } ^ { 2 }$