When is Welch's t-test used?
1 Answer
Nov 24, 2017
A Welch's t-test is a variation of the Student's t-test that is used when the two samples have unequal variances.
Explanation:
A Welch's t-test is a variation of the Student's t-test that is used when the two samples have unequal variances. With a typical Student's t-test, one of the underlying assumptions that needs to be met is that both samples you're testing have equal variances. If you suspect this isn't the case, you use the Welch's t-test.