Suppose a researcher recruited participants and classified them as belonging to four groups: Males with high-school degrees, females with high-school degrees, males without high-school degrees, and females without high school degrees. The researcher then calculated the average income for the participants in each group. a. What type of factorial design is this? Identify the factors and levels. b. Suppose the researcher found that, on average, the female participants earned less than the male participants. What type of effect would this be? Explain how you know? Suppose that the researcher found that, for participants with a high-school degree, males earn more than females on average. However, the researcher also found that, for participants without a high-school degree, there is no difference between the average income of males and females. What type of effect would this be? Explain how you know