d. AUC¼c¼
wþ 0 : 5 z
np¼
38,198ð: 786 Þþ 0 : 5 ð38,198Þð 0 : 005 Þ
38,198¼ 0 : 789
e. The AUC for the no interaction model is smaller
than the AUC for the interaction model because the
former model is nested within the latter model.
Answers to Practice Exercises 387