|
|
Table 5. Analysis of variance (ANOVA) for the fitted quadratic polynomial model for optimization of exopolysaccharides production of Rhizobium sp. |
| Factor |
Sum of squares (SS) |
Degrees of Freedom (DF) |
Mean Square (MS) |
F-value |
p-value |
| X1 (L) |
0.093711 |
1 |
0.093711 |
1027.092 |
0.000000 |
| X1(Q ) |
0.004610 |
1 |
0.004610 |
50.527 |
0.000033 |
| X2 (L) |
0.046428 |
1 |
0.046428 |
508.865 |
0.000000 |
| X3(L) |
0.007538 |
1 |
0.007538 |
82.620 |
0.000004 |
| X1 (L) x X2 (L) |
0.012730 |
1 |
0.012730 |
139.524 |
0.00000 |
| X1 (L) x X3 (L) |
0.002105 |
1 |
0.002105 |
23.068 |
0.000720 |
| X2(L) x X3 (L) |
0.001172 |
1 |
0.001172 |
12.840 |
0.004984 |
| Lack of fit |
0.001127 |
1 |
0.001127 |
12.353 |
0.005587 |
| Pure error |
10 |
0.000091 |
|
|
|
| Total sum of squares |
0.170333 |
18 |
|
|
|
| Legend: L: linear; Q: quadratic; X1: Calcium Carbonate Concentration; X2: Aeration; X3: Agitation. |
|
|