Table 10.8 relates y = exam score (1 = below median, 2 = above median) to gender, controlling for the subject of the exam (Math, Verbal). Show that subject of exam is a suppressor variable.

TABLE 10.8 Math Verbal Gender y = 1 y = 2 y = 1 y = 2 Females 100 50 50 100 Males 50 100 100 50