A recent GSS asked, “What is the ideal number of kids for a family?” Table 12.28 shows results of evaluating the effects of gender and race.

(a) Explain how to interpret the results of the F tests.

(b) Let s = 1 for females and 0 for males, and let r = 1 for blacks and 0 for whites. The no interaction model has

ˆy = 2.42 + 0.04s + 0.37r. Find the estimated mean for each combination of gender and race. Explain how these means satisfy “no interaction.”