In this chapter, we address five questions:
1. What are the advantages of expanding a simple experiment to include more levels of the independent variable? Specifically, we address the benefits in terms of
- generalizing results to a range of levels of the independent variable
- construct validity
2. What is the logic behind ANOVA?
3. What is an ANOVA summary table and how do you interpret one?
4. Why are post-hoc tests used?
5. How and why would you do a trend analysis?