13.18. An article7 on predicting attitudes toward homosexuality modeled a response variable with a four-point scale in which homosexual relations were scaled from 1 =

always wrong to 4 = never wrong, with x1 = education

(in years), x2 = age, x3 = political conservative (1 = yes, 0 = no), x4 = religious fundamentalist (1 = yes, 0 = no), and x5 = whether live in same city as when age 16 (1 =

yes, 0 = no). The prediction equation allowing interaction between x1 and x3 is

ˆy = 0.94 + 0.13x1 − 0.01x2

+1.10x3 − 0.38x4 − 0.15x5 − 0.12(x1 × x3).

Report the prediction equations for political conservatives and nonconservatives. Explain how these suggest that greater education corresponds to less negative views about homosexuality for nonconservatives but may have no effect for conservatives.