Estimate

Std. Error

t value

Pr(>|t|)

(Intercept)

5.54E−16

1.16E−01

0

1

X2

−2.232E+00

7.47E−01

−2.987

0.00921

**

X4

3.67E+00

1.11E+00

3.299

0.00487

**

X8

−3.834E+00

1.65E+00

−2.329

0.03424

*

X9

1.925E+00

9.95E−01

1.934

0.07217

.