Question

testing for the differences between means of 2 independent populations where the variances in each population r unknown, u must first perform the F-test for the difference between 2 variances. Which of the following is correct? a)If the null hypothesis of the F-test is rejected, then use the pooled variance t test for the difference between the means. b)If the null hypothesis of the F-test is not rejected, then use the separate variance t test for the difference between the means. c) If the alternative hypothesis of the F-test is accepted, then use the pooled variance t test for the difference between the means. d)Both (a)n(c)are correct. e)None

Answer 1

You may want to check this, but I would lean towards d) because a) and c) are saying the same thing. If the null is rejected, then the alternative would be accepted. Usually when doing an F-test and the null is rejected, it is often necessary to do additional analysis to test for difference between means.