For recent General Social Survey data, a prediction equation relating Y =

whether attended college (1 = yes) to x = family income (thousands of dollars, using scores for grouped categories), m = whether mother attended college (1 = yes, 0 = no), f = whether father attended college (1 = yes, 0 = no), was logit[ ˆ P(Y = 1)] = −1.90 + 0.02x + 0.82m + 1.33f . To summarize the cumulative effect of the predictors, report the range of ˆπ values between their lowest levels (x = 0.5, m = 0, f = 0) and their highest levels

(x = 130, m = 1, f = 1).