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Table 4. Results of regression analysis and corresponding t and p-value of full second-order polynomial model for optimization of exopolysaccharides production of Rhizobium sp. |
|
Factor |
Regression coefficient |
Standard deviation |
t-statistic |
p-value |
|
β0 |
-0.361612 |
0.053958 |
-6.70172 |
0.000054 |
|
β1 (L ) |
1.147835 |
0.151855 |
7.55876 |
0.000019 |
|
β11 (Q) |
-0.714687 |
0.100544 |
-7.10821 |
0.000033 |
|
β2 (L) |
-0.081844 |
0.015520 |
-5.27338 |
0.000361 |
|
β3 (L) |
-0.000081 |
0.000027 |
-2.96353 |
0.014202 |
|
β1 (L) x β2(L) |
0.205141 |
0.017367 |
11.81202 |
0.000000 |
|
β1 (L) x β3 (L) |
0.000153 |
0.000032 |
4.80296 |
0.000720 |
|
β2 (L) x β3 (L) |
0.000052 |
0.000014 |
3.58331 |
0.004984 |
| Legend: L: linear; Q: quadratic; X1: Calcium Carbonate Concentration; X2: Aeration; X3: Agitation; β: terms coefficients. |
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