In testing the difference between two population means, for which the population variances are unknown and are not assumed to be equal, two independent samples of large sizes are drawn from the populations. Which of the following tests is appropriate?
A) Z-test.
B) Pooled-variances t-test.
C) Unequal variances t-test.
D) Matched pairs t-test.

Question

Quizplus · Accepted Answer

When population variances are unknown and assumed to not be equal, the appropriate test is the unequal variances t-test. This test allows for the use of two independent samples of large sizes without assuming that the variances are equal. Option A and B assume equal population variances, and option D assumes paired samples.

In Testing the Difference Between Two Population Means, for Which