If we are testing for the difference between the means of 2 independent populations presuming equal variances with samples of n₁ = 20 and n₂ = 20, the number of degrees of freedom is equal to
A) 39.
B) 38.
C) 19.
D) 18.

Question

Quizplus · Accepted Answer

When testing the difference between means of two independent populations with equal variances, the degrees of freedom is calculated as n₁ + n₂ - 2. Here, it is 20 + 20 - 2 = 38.

If We Are Testing for the Difference Between the Means