A Complex Evaluation and Optimization Approach for Oxygen-Enriched Combustion Characteristics of Blended Fuels Based on Response Surface Methodology

Table 4

The confidence of the two equations for comprehensive combustion characteristic index.

Factor	Parameter estimation	Degree of freedom	Standard deviation	95% confidence interval lower control limit	95% confidence interval upper control limit	Significant factor
Value	8.97	1.00	0.83	6.73	10.76
Oxygen concentration, A	5.31	1.00	0.77	3.37	7.32	1.12
Heating rate, B	9.95	1.00	0.91	8.26	11.88	1.12
AB	4.83	1.00	1.02	2.26	7.27	1.12
A^2	1.47	1.00	1.03	−1.28	4.31	1.03
B^2	3.94	1.00	1.15	1.08	7.06	1.03