4. In planning a study involving a factorial ANOVA, which statement is not true? a. Using equal number of subjects per cell makes the analysis simpler and maximizes power. b. The number of groups for each factor should not be so large as to make gathering enough subjects difficult. c. It is desirable to include many factors in the design to increase result generalizability. d. As in one-way ANOVA, random assignment of subjects improves internal validity.