If the sample sizes in the two groups are each greater than _____ and roughly comparable,then the independent groups t test is robust to rather severe departures of the _____ assumption.
A)40;normality
B)100;heterogeneity of variance
C)40;probability
D)100;unequal n

Question

Quizplus · Accepted Answer

The independent groups t test is robust to rather severe departures of the normality assumption if the sample sizes in the two groups are each greater than 40 and roughly comparable. Therefore, option A is the best choice. Option B is incorrect because it refers to heterogeneity of variance, which is a different assumption. Option C is vague and does not address the assumptions needed for the independent groups t test, and option D is incorrect because it refers to unequal sample sizes, which is only one aspect of the assumptions needed for the independent groups t test.

If the Sample Sizes in the Two Groups Are Each