Statistical Analysis of the Tensile Strength of Coal Fly Ash Concrete with Fibers Using Central Composite Design

Table 4

ANOVA of flexural strength and split tensile strength.

	SS	df	MS			SS	df	MS
(L)	0.18677	1	0.18677	4.0929	0.0828	1.26956	1	1.269	4.620	0.0686
(Q)	0.13010	1	0.13010	2.8510	0.1352	2.77308	1	2.773	10.09	0.0155
(L)	3.90324	1	3.90324	85.533	0.0001	4.17901	1	4.179	15.20	0.0059
X2 (Q)	0.85295	1	0.85295	18.691	0.0035	5.10799	1	5.107	18.59	0.0035
(L) by (L)	0.03422	1	0.03422	0.7499	0.4152	0.04840	1	0.048	0.1761	0.6873
Error	0.31944	7	0.04563			1.92339	7	0.2747
Total SS	5.33507	12				14.15548	12