Refer to Data Set 9 “Bear Measurements” in Appendix B and use the sex,age, and weight of the bears. For sex, let 0 represent female and let 1 represent male. Letting the response (y) variable represent weight, use the variable of age and the dummy variable of sex to find the multiple regression equation. Use the equation to find the predicted weight of a bear with the characteristics given below. Does sex appear to have much of an effect on the weight of a bear?

a. Female bear that is 20 years of age
b. Male bear that is 20 years of age

Data Set 9: Bear Measurements 

Data are from 54 anesthetized wild bears (first five rows shown here). AGE is in months, MONTH is the month of measurement 1 = January, SEX is coded with 0 = female and 1 = male, HEADLEN is head length (inches), HEADWDTH is width of head (inches), NECK is distance around neck (in inches), LENGTH is length of body (inches), CHEST is distance around chest (inches), and WEIGHT is measured in pounds. Data are from Gary Alt and Minitab, Inc.