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 4.262

61. Calculating and Interpreting .

  1. Calculate the value of , the standard error of the estimate.
  2. Interpret the value of , so that a nonstatistician could understand it.

4.3.61

(a) (b) If we know car's engine size (), then our estimate of the combined mpg will typically differ from the actual mpg by 1.5887 mpg.