7.32. A study11 of bulimia among college women considered the effect of childhood sexual abuse on various components of a Family Environment Scale. For a measure of family cohesion, the sample mean for the bulimic students was 2.0 for 13 sexually abused students and 4.8 for 17 nonabuscd students.

Table 7.19 shows software results of a two-sample comparison of means.

(a) Assuming equal population standard deviations, construct a 95% confidence interval for the difference in mean family cohesion forsexually abused students and nonabused students.

Interpret.

(b) Explain how to interpret results ofsignificance tests from this printout.