PSY 555 Homework 21

1. Explain the two kinds of error rates. How is each affected by the number of comparisons you make?

2. What are some ways to reduce family wise error rate?

3. Why do we adjust our alpha level for post-hoc testing?

4. Do we ever adjust our alpha level for a priori tests? Why or why not?

5. Under what conditions, do a priori tests resemble post hoc tests?

6. If my alpha level is .05 and I make 4 comparisons, what is my approximate probability of committing a Type I error?