Exercises
- 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).
- Make up data where there is an effect of B and an interaction but no effect
of A.
- What part of the ANOVA summary table is unaffected by group size?
- Make up means so that there is a crossover interaction (the lines cross).
- Is it necessary for the lines to cross in order for there to be a significant
interaction?
- 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.
- Make up means so that the simple effect of A at B1 is the opposite of the
simple effect of A at B2.
- Make up means so that the there is a A x B(lin) component to the interaction
but no A x B(quad) component.