salary? b.) Estimate a multiple linear regression model on all the predictors. Report the results of this model in the table below: QUESTION ANSWER Report the coefficient on gender. Interpret this coefficient. Report the coefficient on graduate_degree. Interpret this coefficient. Predict the salary for a male working for a firm size of 245, with 15 years of experience, and a graduate degree. Predict the salary for a female working for a firm size of 245, with 15 years of experience, and a graduate degree. Comment on the results. Is there evidence of a gender- based salary differential? What is your estimate of this differential