Table 3.

Coefficients of the second order equations, prediction models for chlorophyll a production.

Analysis of variance
Source of variation	DF	Sum of squares	Mean Square	F-Value	P-Value
Model	14	0.58	0.04	4.447
Error	11	0.10	0.01	Prob > F	P < 0.001
C. Total	25	0.68		0.0087
Lack of Fit
Lack-of-Fit	10	0.10	0.10	Prob > F	P > 0.10
Pure Error	1	0.00	0.00
Total Error	11	0.10
Parameter estimates
Source	DF	Coefficient	Standard error	F-Value	P-Value
Interceptor	1	0.680	0.038	18.96	< 0.0001*
X1 (Medium: 1,3)	1	−0.059	0.022	15.83	< 0.0001*
X2 (salinity: 25,55)	1	0.026	0.022	62.89	< 0.0001*
X3 (Day: 1,6)	1	0.140	0.022	673.3	< 0.0001*
X4 (Solvent: 1,3)	1	0.013	0.022	1.22	0.2939
X12 (Medium*Medium)	1	0.008	0.060	0.14	0.5546
X22 (salinity*salinity)	1	−0.077	0.060	0.08	0.7753
X32 (Day*Day)	1	0.012	0.060	40.04	< 0.0001*
X32 (Solvent*Solvent)	1	−0.004	0.060	0.06	0.1213
X1 X2 (Medium*Salinity)	1	0.008	0.024	38.59	< 0.0001*
X1 X3 (Medium*Day)	1	−0.059	0.024	51–16	< 0.0001*
X1 X4 (Medium*Solvent)	1	−0.046	0.024	−1.89	< 0.0001*
X2 X3 (Salinity*Day)	1	0.032	0.024	1.33	0.0003**
X2 X4 (Salinity*Solvent)	1	−0.004	0.024	42.04	< 0.0001*
X3 X4 (Day*Solvent)	1	−0.017	0.024	7.04	0.0010**