Many school children receive instruction on child abuse around the “good touch-bad touch”

model, with the hope that such a program will reduce sexual abuse. Gibson and Leitenberg

(2000) collected data from 818 college students, and recorded whether they had ever received such training and whether they had subsequently been abused. Of the 500 students who had received training, 43 reported that they had subsequently been abused. Of the 318 who had not received training, 50 reported subsequent abuse.

a. Do these data present a convincing case for the efficacy of the sexual abuse prevention program?

b. What is the odds ratio for these data, and what does it tell you?