Refer to the previous exercise. Let f = 1 for females and 0 for males, and let r = 1 for blacks and 0 for whites. The regression model for predicting y = ideal number of kids is  = 2.42 + 0.04f + 0.37r.
a. Interpret the coefficient of f. What is the practical implication of this estimate being so close to 0?
b. Find the estimated mean for each of the four combinations of gender and race.
c. Summarize what you learn about the effects based on the analyses in this and the previous exercise.