Source

P-Value

Linear interactions

$X_1$

0.001

$X_2$

0.000

$X_3$

0.000

Square interactions

$X_1\ast X_1$

0.993

$X_2\ast X_2$

0.291

$X_3\ast X_3$

0.839

2-Way Interaction

$X_1\ast X_2$

0.162

$X_1\ast X_3$

0.177

$X_2\ast X_3$

0.108

Lack-of-Fit

0.273