Topic 09 Practice Problems

In testing 9 sedans, Car and Driver magazine rated each on 13 different characteristics, including ride, handling, and driver comfort. Each vehicle also received an overall rating. Scores for each vehicle were as follows.

Car	Overall Rating, Y	Ride, X1	Handling, X2	Driver Comfort, X3
1	83	8	7	7
2	86	8	8	8
3	83	6	8	7
4	83	8	7	9
5	92	8	9	9
6	84	8	8	9
7	88	9	7	7
8	82	7	5	8
9	95	8	9	9

1. Determine the least-squares multiple regression equation.

2. Interpret the y-intercept and partial regression coefficients.

3. What is the estimated overall rating for a vehicle that scores 6 on ride, 9 on handling, and 7 on driver comfort?