Table 3 Sequential model sum of squares.

From: Removal of Cr(VI) from aqueous solution using ball mill modified biochar: multivariate modeling, optimization and experimental study

Source

Sum of squares

df

Mean square

F-value

p-value

Remarks

Mean versus Total

3.226E + 05

1

3.226E+05

   

Linear versus Mean

7330.78

5

1466.16

37.07

 < 0.0001

 

2FI versus Linear

83.87

10

8.39

0.1667

0.9974

 

Quadratic versus 2FI

1193.81

5

238.76

21.63

 < 0.0001

Suggested

Cubic versus Quadratic

247.70

15

16.51

8.64

0.0013

Aliased

Residual

17.21

9

1.91

   

Total

3.315E+05

45

7365.59

   
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