Question

Which of the following is a right strategy to figure out whether or not an interaction...

  1. Which of the following is a right strategy to figure out whether or not an interaction exists in a two factor ANOVA in an eyeball analysis based on summary tables of the means.
a.

Compare if one of the main effect is larger than the other main effect.
b.

Calculate if at least one of the simple main effect is larger than 0.
c.

Compare if at least one of the main effects is different from the simple main effects of that independent variable.
d.

Examine if two main effects have different signs (+/-) which indicates different directions of the effect.
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