=+1. If you have not done so already, conduct the multiple regression testing the interaction of TV and Ability on Achievement conducted earlier in this chapter. Compare your results to mine.

Make sure you are able to correctly center the variables and create the interaction term.

Try the different methods for graphing the interaction. The data are on the Web site (www

.ablongman.com/keith1e) (“tv ability interact2.sav,” “tvability interact2.xls,” and “tv_abil.txt”).