3. Anthropologists studied gender differences in public restroom graffiti, noting whether the graffiti occurred in a men's or women's room, and classifying writings as being competitive and derogatory or advisory and sympathetic. a. There are two variables mentioned here; what is the explanatory variable? b. Tell whether the explanatory variable is quantitative or categorical. c. What is the response variable? d. Tell whether the response variable is quantitative or categorical. e. Would type of writings for each gender be summarized with means or proportions