- The data below represent fuel economy (mpg) ratings for different cars. The old ratings are based on tests used before 2008, and the new ratings are based on tests that went into effect in 2008.
Table 4 – Fuel Economy Ratings
| Old | 16 | 27 | 17 | 33 | 28 | 24 | 18 | 22 | 20 | 29 | 21 |
| New | 15 | 24 | 15 | 29 | 25 | 22 | 16 | 20 | 18 | 26 | 19 |
- Find the regression equation.
- Interpret the slope and the -intercept of your regression equation, if possible.
- Use your regression equation to predict the new mpg rating for a car with an old mpg rating of 30.
