You may be able to use an independent groups t test when
A) you have three or more groups
B) your observations are dependent
C) your scores are ordinal
D) your groups' variances are not equal

Question

Quizplus · Accepted Answer

An independent groups t-test is used when comparing the means of two independent groups, assuming equal variances. If variances are not equal, a modified version called Welch's t-test can be used.

You May Be Able to Use an Independent Groups T