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

Question

Quizplus · Accepted Answer

When the standard deviations are unknown, the degrees of freedom for the t distribution is calculated as (n1 + n2 - 2).

To Construct an Interval Estimate for the Difference Between the Means