Develop an estimated regression equation that can be used to predict the Buy Again rating given based on the Steering rating.
a) At the .05 level of significance, test for a significant relationship.
b) Did the estimated regression equation developed in part (a) provide a good fit to the data? Explain.
c) Develop an estimated regression equation that can be used to predict the Buy Again rating given the Steering rating and the Tread Wear rating. d. Is the addition of the Tread Wear independent variable significant? Use a = .05.
| Tire |
Steering |
Tread Wear |
Buy Again |
| Goodyear Assurance TripleTred |
8.9 |
8.5 |
8.1 |
| Michelin HydroEdge |
8.9 |
9 |
8.3 |
| Michelin Harmony |
8.3 |
8.8 |
8.2 |
| Dunlop SP 60 |
8.2 |
8.5 |
7.9 |
| Goodyear Assurance ComforTred |
7.9 |
7.7 |
7.1 |
| Yokohama Y372 |
8.4 |
8.2 |
8.9 |
| Yokohama Aegis LS4 |
7.9 |
7 |
7.1 |
| Kumho Power Star 758 |
7.9 |
7.9 |
8.3 |
| Goodyear Assurance |
7.6 |
5.8 |
4.5 |
| Hankook H406 |
7.8 |
6.8 |
6.2 |
| Michelin Energy LX4 |
7.4 |
5.7 |
4.8 |
| Michelin MX4 |
7 |
6.5 |
5.3 |
| Michelin Symmetry |
6.9 |
5.7 |
4.2 |
| Kumho 722 |
7.2 |
6.6 |
5 |
| Dunlop SP 40 A/S |
6.2 |
4.2 |
3.4 |
| Bridgestone Insignia SE200 |
5.7 |
5.5 |
3.6 |
| Goodyear Integrity |
5.7 |
5.4 |
2.9 |
| Dunlop SP20 FE |
5.7 |
5 |
3.3 |