For the first two years of the study, researchers will follow the subjects with scans and memory tests. Assume the data were analyzed as a two-factor design with pre-post testing as one factor and the...For the first two years of the study, researchers will follow the subjects with scans and memory tests. Assume the data were analyzed as a two-factor design with pre-post testing as one factor and the three drugs as the second factor. It would be the interaction of the two factors since the question is whether the effect of one factor (pre-post) differs as a function of the level of a second factor (drug).
