Table 3. Analysis of variance for the second-order model
Model terms: X
1
, X
2
; X
1
2
, X
2
2
; X
1
X
2
Source
Degrees of freedom
Sum of squares
Mean square
F-value
p-value
Model
5
50.05
10.01
1.32
0.3833
Error
5
37.85
7.57
Total
10
87.90
Root MSE=2.75
r-square=0.5694
Adjusted r-square=0.1388
MSE, mean square error.