18. For the cell counts in Table 10.12 iclating Y = exam score (I = below median. 2 = above median) to gender, controlling for subject of exam (Math. Verbal).

a) Is subject of exam a suppressor variable? Explain.

b) Is there interaction? Explain. TABLE 10.12 Math Verhal Gender y=1 Y = 2 Y = 1 Y = 2 Females 100 50 50 100 Males 50 100 100 50