ANOVA for response surface quadratic model

Analysis of variance table (sum of squares)

Code

Sum of squares

Mean square

F Value

P-value Prob > F

Significance

Model

2.02

0.22

10.42

0.0005

significant

x₁-Skim milk

0.053

0.053

2.47

0.1471

x₂-Sacarose

0.024

0.024

1.11

0.3165

x₃-Trehalose

0.19

0.19

8.61

0.0149^*

x₁x₂

0.76

0.76

35.13

0.0001^*

x₁x₃

0.097

0.097

4.50

0.0600

x₂x₃

0.31

0.31

14.49

0.0034^*

x₁²

0.14

0.14

6.47

0.0292^*

x₂²

0.49

0.49

22.90

0.0007^*

x₃²

0.027

0.027

1.27

0.2863

Lack of fit

0.20

0.040

13.17

0.0067

significant