Terms

Coefficients

Standard deviation

Constant

2.156

0.015

X1

-0.183

0.017

X2

0.060

0.017

X3

-0.038

0.017

X1 X2

-0.012

0.017

X1 X3

0.035

0.017

X2 X3

0.037

0.017

Table 4: Model coefficient s and standard deviations.