Here Y is food expenditure, X is income and D = 1 if female and D = 0 if male. (a) Using the data set (foodexpenditure.x]s) provided in the blackboard, estimate the regression function to examine whether food expenditure is different across genders. Interpret your estimated results: explain if food expenditures are different between males and females. Also comment on the statistical significance of your findings. (10) (b) To allow interactions between X and D estimate the following regression function. (10) Y=b +bX +bD +b (XD)+e (2) 3