In the t test for independent groups, the unbiased estimate of the population variance 2 is _________. A) s 12 alone B) s 22 alone C) a weighted average of s 12 and s 22 D) ( ΣS ₁+ ΣS ₂)/( n ₁ + n ₂ - 2) E) c and d

Question

Quizplus · Accepted Answer

The unbiased estimate of the population variance in a t-test for independent groups is a weighted average of the sample variances (s1^2 and s2^2), which is mathematically represented by the formula in option D. This formula calculates the pooled variance, taking into account the variances of both groups and their respective sample sizes. Therefore, both C and D are correct, making E the correct choice.

In the T Test for Independent Groups, the Unbiased Estimate