The Dosage of Superplasticizer in Cemented Coal Waste Backfill Material Based on Response Surface Methodology

Table 4

ANOVA of response surface quadratic model for SP.

	Sum of squares	df	Mean square	F value	value
Model	0.4303	6	0.0717	63.68	<0.0001
A	0.0091	1	0.0091	8.12	0.0137
B	0.0023	1	0.0023	2.07	0.1741
C	0.3467	1	0.3467	307.88	<0.0001
BC	0.0522	1	0.0522	46.39	<0.0001
A^2	0.0081	1	0.0081	7.21	0.0187
C^2	0.0135	1	0.0135	11.97	0.0042
Residual	0.0146	13	0.0011
Lack of fit	0.0146	8	0.0018		<0.0001
Pure error		5
Cor total	0.4449	19	7.916 ∗ 11

Standard deviation: 0.0336; R²: 0.9671; adjusted (R²): 0.9519; adequate precision: 27.8528.