Lecture 10

Question 1

What does thebKruskal- Wallis test tell you?

Answer 1

It says something is going on: at least one group is different from the rest. But does not reveal source of the difference.

Question 2

For Mann-Whitney U test to be significant it must be?

Question 3

First three steps involved in running post-hoc tests after a significant Freiman test?

Answer 3

1. Run every possible pairwise comparison among the groups.
2. Use non-parametric equivalent of a paired samples t-test to run these tests.
3. Adjust the critical p- value

Question 4

What’s the last 3 steps involved in running a post-hoc test after a significant Freidman test?

Answer 4

4. a = .05 divided by the number of post-hoc tests you run.

5. Each wilcoxon test must have an observed p