All t-tests first test for equality of means and then test for equality of variances.

Question

Quizplus · Accepted Answer

There are two types of t-tests: the two-sample t-test and the one-sample t-test. In both cases, the hypotheses are about the means of the populations being compared. However, the assumption of equal variances is tested separately, either using an F-test (two-sample t-test) or a chi-squared test (one-sample t-test). Therefore, t-tests do not first test for equality of variances.

All T-Tests First Test for Equality of Means and Then