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Journal of Environmental and Public Health
/
2023
/
Article
/
Tab 6
/
Research Article
Optimization and Modeling of Cr (VI) Removal from Tannery Wastewater onto Activated Carbon Prepared from Coffee Husk and Sulfuric Acid (H
2
SO
4
) as Activating Agent by Using Central Composite Design (CCD)
Table 6
Fit summary for model selection.
Source
Sequential
-
value
Lack of fit
-
value
Adjusted
R
2
Predicted
R
2
Linear
0.7336
<0.0001
−0.0987
−0.2781
2FI
0.9946
<0.0001
−0.0987
−1.2223
Quadratic
<0.0001
0.5254
0.9996
0.9990
Suggested
Cubic
0.4253
0.4949
0.9996
0.9996
Aliased