Application of Box-Behnken Design in Optimization of Glucose Production from Oil Palm Empty Fruit Bunch Cellulose

Table 4

Analysis of variance in the regression model for optimisation of glucose production from OPEFB cellulose.

Source of variations	Degree of freedom	Sum of square	Mean square	𝐹 value	Determination coefficient (𝑅^2)
Regression	8	19264	240.75	31.14**	0.9765
Residual	6	464.04	77.34
Pure error	14	19728.04	170.72
Linear	3	11072.00	3690.67	47.72**
Quadratic	2	2868.57	1434.29	18.55**
Cross-product	3	5323.12	1774.37	22.94**
Lack of fit	1	72.00	72.00	0.92
Total error	5	392.35	78.47

𝐹_0.05 (8,6) = 4.15; 𝐹_0.01 (8,6) = 8.10; 𝐹_0.05 (3,5) = 5.41; 𝐹_0.01 (3,5) = 12.06; 𝐹_0.05 (2,5) = 5.79; 𝐹_0.01 (2,5) = 13.27; 𝐹_0.05 (1,5) = 6.61; 𝐹_0.01 (1,5) = 16.26.
**Significant at 1% level.