a. Mark the residuals on the scatterplot you created in problem 4-49. If you want to purchase an inexpensive pizza, should you go to a store with a positive or negative residual?
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b. What is the sum of the residuals? Are you surprised at this result?
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c. Make a residual plot using your calculator, with the x‑axis representing the number of pizza toppings, and the y‑axis representing the residuals. Interpret the scatter of the points on the residual plot. Is a linear model a good fit for the data?
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HINT: For the LSRL, check line 8 below. For more help go to: https://www.desmos.com/calculator?tour=regressions
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