In testing for the differences between the means of 2 independent populations where the variances in each population are unknown but assumed equal, the degrees of freedom are
A) n - 1.
B) n₁ + n₂ - 1.
C) n₁ + n₂ - 2.
D) n - 2.

Question

Quizplus · Accepted Answer

When testing for the differences between the means of 2 independent populations where the variances in each population are unknown but assumed equal, we use the pooled t-test. The formula for calculating degrees of freedom in this case is (n₁ + n₂ - 2), where n₁ and n₂ are the sample sizes of the populations being compared. Therefore, the correct choice is C.

In Testing for the Differences Between the Means of 2