Homework SourseThe following table presents the highway gasoline mileage pe
The following table presents the highway gasoline mileage performance and engine displacement for Damler-Chrysler vehicles for model year 2005 (source: U.S. Environmental Protection Agency).
Fit a simple linear model relating highway miles per gallon (y) to engine displacement (x) in cubic inches using least squares estimates of the intercept (a) and slope(b).
Find an estimate of the mean highway gasoline mileage performance for a car with 145 cubic inches engine displacement(c).
| Carline | Engine Displacement | MPG (highway) |
| 300C/SRT-8 | 215 | 30.8 |
| CARAVAN 2WD | 201 | 32.5 |
| CROSSFIRE ROADSTER | 196 | 35.4 |
| DAKOTA PICKUP 2WD | 226 | 28.1 |
| DAKOTA PICKUP 4WD | 226 | 24.4 |
| DURANGO 2WD | 348 | 24.1 |
| GRAND CHEROKEE 2WD | 226 | 28.5 |
| GRAND CHEROKEE 4WD | 348 | 24.2 |
| LIBERTY/CHEROKEE 2WD | 148 | 32.8 |
| LIBERTY/CHEROKEE 4WD | 226 | 28 |
| NEON/SRT-4/SX 2.0 | 122 | 41.3 |
| PACIFICA 2WD | 215 | 30 |
| PACIFICA AWD | 215 | 28.2 |
| PT CRUISER | 148 | 34.1 |
| RAM 1500 PICKUP 2WD | 500 | 18.7 |
| RAM 1500 PICKUP 4WD | 348 | 20.3 |
| SEBRING 4-DR | 165 | 35.1 |
| STRATUS 4-DR | 148 | 37.9 |
| TOWN & COUNTRY 2WD | 148 | 33.8 |
| VIPER CONVERTIBLE | 500 | 25.9 |
| WRANGLER/TJ 4WD | 148 | 26.4 |
Solution
