A study used the 1998 Behavioral Risk Factors Social Survey to consider factors associated with American women’s use of oral contraceptives. Table 4.15 summarizes effects for a logistic regression model for the probability of using oral contraceptives. Each predictor uses an indicator variable, and the table lists the category having value 1.

a. Interpret effects.

b. Construct and interpret a confidence interval for the conditional odds ratio between contraceptive use and education.