In this section you will have several problems that help Giulia and her dad open a pizza parlor. To help them, you will create residual plots and analyze them to determine whether a model is an appropriate fit to the data. You will calculate the correlation coefficient and R2 and interpret them in context. This section allows you to use more mathematical terms to describe the form, direction, and strength of an association, and you will discover that “association is not causation” because there might be a lurking variable.