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

The degrees of freedom for a two-sample t-test when variances are unknown but assumed to be equal is calculated as n1 + n2 - 2, where n1 and n2 are the sample sizes from each of the two populations.

In Testing for the Differences Between the Means of 2