Source

Sum of Squares

df

Mean Square

F-value

p-value

Model

943.09

9

104.79

530.77

<0.0001

significant

A-Contact time

154.39

1

154.39

782.00

<0.0001

B-Initial Dye Concentration

2.48

1

2.48

12.55

0.0053

C-pH

623.99

1

623.99

3160.61

<0.0001

AB

1.62

1

1.62

8.21

0.0168

AC

2.42

1

2.42

12.26

0.0057

BC

0.0200

1

0.0200

0.1013

0.7568

A²

48.03

1

48.03

243.29

<0.0001

B²

9.01

1

9.01

45.63

<0.0001

C²

101.70

1

101.70

515.13

<0.0001

Residual

1.97

10

0.1974

Lack of Fit

1.16

5

0.2322

1.43

0.3529

not significant

Pure Error

0.8133

5

0.1627

Cor Total

945.07

19