Table 4.

ANOVA for flexural strength.

Source	DF	Adj SS	Adj MS	F-Value	P-Value
Regression	13	552.090	42.4684	3.95	0.097
A	1	12.115	12.1150	1.13	0.348
B	1	69.462	69.4617	6.47	0.064
C	1	1.177	1.1767	0.11	0.757
D	1	5.895	5.8946	0.55	0.500
B∗B	1	60.712	60.7116	5.65	0.076
C∗C	1	58.752	58.7520	5.47	0.079
D∗D	1	0.374	0.3741	0.03	0.861
A∗B	1	14.920	14.9204	1.39	0.304
A∗C	1	60.594	60.5940	5.64	0.076
A∗D	1	12.832	12.8316	1.19	0.336
B∗C	1	2.383	2.3831	0.22	0.662
B∗D	1	2.821	2.8207	0.26	0.635
C∗D	1	3.708	3.7085	0.35	0.588
Error	4	42.966	10.7416
Total	17	595.056