If we are testing for the difference between two population means and assume that the two populations have equal but unknown standard deviations,then the test has (n₁ + n₂ - 2)degrees of freedom.

Question

Quizplus · Accepted Answer

This is the correct formula for the degrees of freedom when testing for the difference between two population means with equal but unknown standard deviations.

If We Are Testing for the Difference Between Two Population