Let's assume I have 2 groups of subjects (A, B) and I test these groups in a task where I measure reaction time (RT) in two conditions (C1, C2), which I will analyze with an Anova.
Is it legit to hypothesize that RTs for C1 are slower than those of C2 but interdependently from the group? That is, is it possible to hypothesize both a main effect of Condition and a null-effect of the interaction Group * Condition, or is the hypothesis of a null-effect as such invalid?
