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