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 4.263

62. Computing and Interpreting SST, SSR, and .

  1. Calculate the sample variance of the data, . Then use to calculate SST.
  2. Use SSE and SST to find SSR. Explain clearly what it is that SSR is measuring.
  3. Calculate and interpret the coefficient of determination, .