Question: Look over the expenditure categories that the CEO gave you. Would you expect an interaction between the category Capital Equipment and Materials, and the category Salary and Expenses? Are the two independent of each other? Check to see if the data contains this interaction. (10 pts)

Based on the categories in your data file and the results of your analysis in question 1, write down the multiple regression equation for this problem with quarterly sales as the y-variable and the expenditure categories as the x-variables; do not forget the interaction term if there is one. Define each variable in the equation. (10 pts)