Pizza ratings, part 2.

Here’s a scatterplot of the residuals against predicted values for the regression model found in Exercise 17.

a) The two extraordinary points in the lower right are Reggio’s and Michelina’s, two gourmet brands. Interpret these points.

b) Do you think these two pizzas are likely to be influential in the regression. Would setting them aside be likely to change the coefficients? What other statistics might help you decide?

Transcribed Image Text:

Residuals -30 15 0 -15 50.0 62.5 75.0 Predicted