To construct an interval estimate for the difference between the means of two populations when the standard deviations of the two populations are unknown and it can be assumed the two populations have equal variances, we must use a t distribution with (let n₁ be the size of sample 1 and n₂ the size of sample 2) _____ degrees of freedom. A) (n₁ + n₂) B) (n₁ + n₂ - 1) C) (n₁ + n₂ - 2) D) (n₁ - 1)

Question

Quizplus · Accepted Answer

The correct formula for the degrees of freedom when estimating the difference between the means of two populations with unknown but assumed equal variances is the sum of the sample sizes minus 2, which is represented by (n1 + n2 - 2).

To Construct an Interval Estimate for the Difference Between the Means