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just (a) and (b) please

Suppose we have a data set with five predictors: $X_{1}=GPAX_{2}=IQX_{3}=Sex(1for Female and0forMale)X_{4}=Interaction between GPA and IQX_{5}=Interaction between GPA and Gender.?$ The response is starting salary after graduation (in thousands of dollars). Suppose we use least squares to fit the model, and get $?^?_{0}=50,?^?_{1}=20,?^?_{2}=0.07,?^?_{3}=35,?^?_{4}=0.01,?^?_{5}=?10$. (a) Write the model describing the relationship between Starting Salary, GPA, IQ and Sex for female graduates. (b) Write the model describing the relationship between Starting Salary, GPA, IQ and Sex for male graduates. (c) Which answer is correct, and why? - i. For a fixed value of IQ and GPA, males earn more on average than females. - ii. For a fixed value of IQ and GPA, females earn more on average than males. - iii. For a fixed value of IQ and GPA, males earn more on average than females provided that the GPA is high enough. - iv. For a fixed value of $IQ$ and GPA. females earn more on average than males provided that the GPA is high enough. (d) Predict the salary of a female with IQ of 110 and a GPA of $4.0$.

Let Y be the Starting SalaryA) Now the m

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