5. Given the following model logit P(X) + BNS + BOC + 3AFS+AGE + 72 RACE, where NS denotes number of sex partners in one's lifetime, OC denotes oral contraceptive use (yes/no), and AFS denotes age at first sexual intercourse experience, answer the following questions about the above model:

a. Give an expression for the odds ratio that compares a person who has NS 5, OC = 1, and AFS = 26 to a person who has NS = 5, OC = 1, and AFS = 16, controlling for AGE and RACE.

b. Give an expression for the odds ratio that compares a person who has NS200, OC = 1, and AFS = 26 to a person who has NS=5, OC 1, and 16, controlling for AGE and RACE. AFS = =