Table 2 ANOVA for removal of MB.

From: Optimization by Box–Behnken design for environmental contaminants removal using magnetic nanocomposite

Source

Sum of squares

Degree of freedom

Mean square

F-value

p-value

Model

11,507.80

14

821.99

779.99

 < 0.0001

significant

A

887.69

1

887.69

842.34

 < 0.0001

 

B

145.81

1

145.81

138.36

 < 0.0001

 

C

64.31

1

64.31

61.02

 < 0.0001

 

D

152.80

1

152.80

144.99

 < 0.0001

 

AB

214.92

1

214.92

203.94

 < 0.0001

 

AC

2469.59

1

2469.59

2343.42

 < 0.0001

 

AD

45.43

1

45.43

43.11

 < 0.0001

 

BC

760.10

1

760.10

721.27

 < 0.0001

 

BD

294.98

1

294.98

279.91

 < 0.0001

 

CD

394.22

1

394.22

374.08

 < 0.0001

 

A2

3221.76

1

3221.76

3057.15

 < 0.0001

 

B2

3278.39

1

3278.39

3110.89

 < 0.0001

 

C2

31.62

1

31.62

30.00

 < 0.0001

 

D2

1345.55

1

1345.55

1276.80

 < 0.0001

 

Residual

14.75

14

1.05

   

Lack of fit

10.44

10

1.04

0.9692

0.5627

Not significant

Pure error

4.31

4

1.08

   

Cor total

11,522.55

28

    

R2 = 0.9987

Adjusted R2 = 0.9974

Predicted R2 = 0.9942

Adeq-Precision = 92.75