Coefficient Standard Error T- value P- value
PFS Constant -202.653 51.7903 -3.913 0.006
Dosage 0.206 0.1201 1.717 0.130
pH 67.308 8.9396 7.529 0.000
Dosage x Dosage -0.0001 0.0001 -1.811 0.113
pH x pH -4.011 0.4701 -8.533 0.000
Dosage x pH -0.013 0.0141 -0.943 0.377
PFPD1 Constant 20.8148 12.5798 1.655 0.142
Dosage 0.0538 0.0292 1.843 0.108
pH 17.8347 2.1714 8.213 0.000
Dosage x Dosage -0.00011 0.0000 -6.184 0.000
pH x pH -1.2970 0.1142 -11.359 0.000
Dosage x pH 0.0041 0.0034 1.211 0.265
PFPD2 Constant -229.289 84.0865 -2.727 0.029
Dosage -0.168 0.1950 -0.861 0.418
pH 90.988 14.5143 6.269 0.000
Dosage x Dosage -0.0002 0.0001 -1.668 0.139
pH x pH -6.793 0.7633 -8.900 0.000
Dosage x pH 0.041 0.0228 1.787 0.117
PFPD3 Constant -147.146 93.9803 -1.566 0.161
Dosage -0.548 0.2180 -2.516 0.040
pH 88.485 16.2221 5.455 0.001
Dosage x Dosage -0.00046 0.0001 3.414 0.011
pH x pH -9.001 0.8531 -10.551 0.000
Dosage x pH 0.125 0.0255 4.881 0.002
Table 5: Estimated regression coefficients and corresponding T- and P-values for turbidity removal.
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