Experimental Study on Strengthening and Sealing Materials and Their Application in Coal Mines

Table 5

Response surface quadratic model and analysis of variance results.

Source	Sum of squares	Degree of freedom	Mean square	F-value	value; Prob. > F
Model	116.93	9	12.99	57.15	<0.0001	Significant
A	26.87	1	26.87	118.21	<0.0001
B	3.96	1	3.96	17.40	0.0042
C	56.02	1	56.02	246.41	<0.0001
AB	4.579E − 003	1	4.579E − 003	0.020	0.8911
AC	0.25	1	0.25	1.12	0.3259
BC	0.35	1	0.35	1.55	0.2528
A^2	2.97	1	2.97	13.05	0.0086
B^2	0.37	1	0.37	1.62	0.2439
C^2	1.13	1	1.13	4.97	0.0610
Residual	1.59	7	0.23
Lack of fit	0.75	5	0.15
Pure error	0.84	2	0.42
Cor. total	118.52	16