Fuel Economy. For Exercises 60–67, refer to the table of fuel economy data from Exercises 80–84 in Section 4.2. The predictor variable is , expressed in liters; the response variable is , expressed in miles per gallon (mpg).

Question 4.261

60. Calculating and interpreting the residuals and SSE and .

  1. Compute the residual for each data value. Form a table similar to Table 7 of the residuals and squared residuals. Sum the squared residuals to get SSE.
  2. What does SSE measure? At this point, do we know whether SSE is large or small? Why or why not?
  3. Which vehicle has the largest absolute residual? Clearly explain why this vehicle is unusual.