![]() For your convenience, we describe both versions.Īs we commonly perform a paired t-test when we have data about the same subjects measured twice (before and after some treatment), let us adopt the convention of referring to the samples as the pre-group and post-group. There is a version of a t-test which can be applied without the assumption of homogeneity of variance: it is called a Welch's t-test. įormally, to perform a t-test, we should additionally assume that the variances of the two populations are equal (this assumption is called the homogeneity of variance). ![]()
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