13.39 House prices Use software with the House Selling Prices OR data file on the book’s website to do residual analyses with the multiple regression model for y = house selling price (in thousands), x1 = lot size, and x2 = number of bathrooms.

a. Find a histogram of the standardized residuals. What assumption does this check? What do you conclude from the plot?

b. Plot the standardized residuals against the lot size. What does this check? What do you conclude from the plot?