Estimate Std.

Error

t value

Pr(>|t|)

(Intercept)

30.243277

1.271720

23.781

<2e−16

disp

−0.004566

0.006239

−0.732

0.465

hp

−0.056568

0.012342

−4.583

6.18e−06

poly(weight, 2)1

−82.405941

11.391152

−7.234

2.53e−12

poly(weight, 2)2

27.526552

4.095624

6.721

6.48e−11