The quantity 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

The quantity  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.

Quizplus · Accepted Answer

The quantity 11ea78b9_2e2c_eb3e_8379_65019d137738_TB4388_11 is calculated using the formula for pooled variance estimate, which takes into consideration the degrees of freedom for each sample. The degrees of freedom determine how much weight each sample variance carries in the calculation of the pooled variance estimate. Consequently, the correct choice is C.

The Quantity Is Called the Pooled Variance Estimate of the Common