Ch. 8

Flow chart

















Between groups designs





Within groups designs





Completely randomized designs

1.Randomize groups

2. Manipulate

3. Compare data



Multilevel Completely Randomized Design

1. Randomize groups

2. Manipulate

3. Compare data



Factorial designs=more than 2 independent variables































Eight possible outcomes for a 2x2 design.

1. Non significant effects





















2. Significant effect for A only





























3. Significant effect for B only































4. Significant interaction alone













































5. Interaction and Main effect for A significant





























6. Interaction and Main effect for B significant

















































7. Main effects only significant





























8. All effects significant