When the standard deviations are equal but unknown,a test for the differences between two population means has n − 1 degrees of freedom.

Question

Quizplus · Accepted Answer

When comparing two population means with equal but unknown standard deviations, the degrees of freedom for the test are calculated using a formula that combines the sample sizes of both groups, not simply n - 1. The formula for degrees of freedom in this case is more complex, often involving both sample sizes.

When the Standard Deviations Are Equal but Unknown,a Test for the Differences