| Estimate Std. | Error | t value | Pr(>|t|) |
(Intercept) | 30.189044 | 2.392397 | 12.619 | <2e−16 |
as.factor(cyl)4 | 8.043303 | 2.194154 | 3.666 | 0.000281 |
as.factor(cyl)5 | 7.349540 | 3.308410 | 2.221 | 0.026900 |
as.factor(cyl)6 | 3.340332 | 2.454866 | 1.361 | 0.174405 |
as.factor(cyl)8 | 6.029386 | 2.850316 | 2.115 | 0.035043 |
disp | −0.025641 | 0.008108 | −3.162 | 0.001690 |
hp | −0.078389 | 0.013644 | −5.745 | 1.87e−08 |