A study of the relationship between student’s high school GPA and mother’s employment (yes, no) suspects an interaction with the gender of a student. Controlling gender, Table 10.10 shows results.

(a) Describe the relationship between mother’s employment and GPA for females and for males. Does this sample show evidence of statistical interaction?

Explain.

(b) A journal article written about the study states,

“Having a mother who is employed outside the home seems to have positive effects on daughter’s achievement in high school, but no substantive effect on son’s achievement.” Explain how Table 10.10 suggests this interpretation.

TABLE 10.10 Mean GPA by Mother’s Employment, Controlling for Gender Gender Mother Employed Mother Not Employed Females 2.94 2.71 Males 2.72 2.74