In the article “Gender and parenting significantly affect work hours of recent dermatology program graduates” published in the Archives of Dermatology (Jacobson et al., 2004), the authors reported the results given in Table 9.34 for a regression model to predict the number of hours per week spent seeing patients for recent dermatology program graduates. The multiple regression model reported by the authors included dummy variables for the sex of an individual, marital status, parental status, and the interaction between sex and parental status. Use the information in Table 9.34 to answer the following:

(a) Does the marital status of a recently graduated dermatologist appear to be an important variable for predicting the number of hours per week spent seeing patients? Explain.

(b) Does the parental status of a recently graduated dermatologist appear to be an important variable for predicting the number of hours per week spent seeing patients? Explain.

(c) Does the sex of a recently graduated dermatologist appear to be an important variable for predicting the number of hours per week spent seeing patients?

Explain.

(d) How could the simultaneous importance of the dummy variables for the sex, marital status, parental status, and interaction between sex and parental status be tested?