Please use the accompanying Excel data set or accompanying Text file data set when completing the following exercise. 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). Carline 300C/SRT-8 CARAVAN 2WD CROSSFIRE ROADSTER DAKOTA PICKUP 2WD DAKOTA PICKUP 4WD DURANGO 2WD GRAND CHEROKEE 2WD GRAND CHEROKEE 4WD LIBERTY/CHEROKEE 2WD LIBERTY/CHEROKEE 4WD NEON/SRT-4/SX 2.0 PACIFICA 2WD PACIFICA AWD PT CRUISER RAM 1500 PICKUP 2WD RAM 1500 PICKUP 4WD SEBRING 4-DR STRATUS 4-DR TOWN & COUNTRY 2WD VIPER CONVERTIBLE WRANGLER/TJ 4WD Engine Displacement MPG (highway) 215 30.8 32.5 201 196 226 226 348 226 348 148 226 122 215 215 148 500 348 165 148 148 500 148 35.4 28.1 24.4 24.1 28.5 24.2 32.8 28.0 41.3 30.0 28.2 34.1 18.7 20.3 35.1 37.9 33.8 25.9 26.4 (a) Fit a simple linear model relating highway miles per gallon (y) to engine displacement (x) in cubic inches using least squares. Estimate the slope and intercept. Intercept Round your answer to one decimal place (e.g. 98.7). Slope= Round your answer to four decimal places (e.g. 98.7654). (b) Find an estimate of the mean highway gasoline mileage performance for a car with 149 cubic inches engine displacement. Estimate- Round your answer to two decimal places (e.g. 98.76).

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