Table 3 ANOVA of Box-Behnken design representing bacterial nanocellulose production by B. haynesii as influenced by temperature (X1), date waste extract (%) (X2), and initial pH level (X3).
Source of variance | Sum of Squares | df | Mean Square | F-value | P-value Prob > F | Coefficient estimate | |
|---|---|---|---|---|---|---|---|
Model | 9.94 | 9 | 1.10 | 255.50 | < 0.0001 | 2.53 | |
Linear effects | X1 | 2.14 | 1 | 2.14 | 495.56 | < 0.0001 | 0.52 |
X2 | 0.21 | 1 | 0.21 | 48.86 | 0.0009 | -0.16 | |
X3 | 0.47 | 1 | 0.47 | 108.82 | 0.0001 | -0.24 | |
Interaction effects | X1 X2 | 0.92 | 1 | 0.92 | 213.17 | < 0.0001 | -0.48 |
X1 X3 | 0.64 | 1 | 0.64 | 148.03 | < 0.0001 | -0.40 | |
X2 X3 | 0.00 | 1 | 0.00 | 0.83 | 0.4033 | 0.03 | |
Quadratic effects | X12 | 1.03 | 1 | 1.03 | 239.15 | < 0.0001 | -0.53 |
X22 | 2.92 | 1 | 2.92 | 675.22 | < 0.0001 | -0.89 | |
X32 | 2.39 | 1 | 2.39 | 552.30 | < 0.0001 | -0.80 | |
Error effects | Lack of fit | 0.02 | 3 | 0.01 | 1.5 | 0.4249 | |
Pure error | 0.01 | 2 | 0.00 | ||||
Std. dev | 0.07 | R2 | 0.9978 | ||||
Mean | 1.35 | Adj R2 | 0.9939 | ||||
C.V. % | 4.88 | Pred R2 | 0.9745 | ||||
PRESS | 0.25 | Adeq precision | 41.97 | ||||
