Pizzas, again. Display 3.83 shows the pizza data from E12 on page 134, with its regression line.
a. Estimate the residuals from the graph, and use your estimates to sketch a rough version of a residual plot for this data set.
 b. Which pizza has the largest positive residual? The largest negative residual? Are any of the residuals so extreme as to suggest that those pizzas should be regarded as exceptions?
 c. Is any one of the pizzas a highly influential data point? If so, specify which one(s), and describe the effect on the slope of the fitted line and the correlation of removing the influential point or points from the analysis.
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