In testing for the differences between the means of two 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 two independent populations with unknown but equal variances, we use the two-sample t-test. The degrees of freedom for this test are calculated as follows:

df = n₁ + n₂ - 2

where n₁ and n₂ are the sample sizes from each population. Therefore, choice C is the correct answer.

In Testing for the Differences Between the Means of Two