Exercises

  1. Note that for the default data there is an effect of B but no effect of A. Make up a dataset where there is an effect of A but no effect of B and no interaction (The two lines on the graph will be overlayed).

  2. Make up data where there is an effect of B and an interaction but no effect of A.

  3. What part of the ANOVA summary table is unaffected by group size?

  4. Make up means so that there is a crossover interaction (the lines cross).

  5. Is it necessary for the lines to cross in order for there to be a significant interaction?

  6. Make up means so that the simple effect of A is in the same direction for all levels of B, but is larger at B2 then it is at B1 or B3.

  7. Make up means so that the simple effect of A at B1 is the opposite of the simple effect of A at B2.

  8. Make up means so that the there is a A x B(lin) component to the interaction but no A x B(quad) component.