Table 5.

ANOVA for MR.

Source	Sum of Squares	Degree of Freedom	Mean Square	F-Value	p-Value	Remarks
Model	1.63	20	0.0813	10.89	0.0001	significant
A—Processing time	0.4874	1	0.4874	65.29	<0.0001
B—Surface rotational speed	0.0561	1	0.0561	7.51	0.0192
C—Wt% of abrasives	0.0963	1	0.0963	12.9	0.0042
D—Chemical concentration	0.0486	1	0.0486	6.51	0.0269
E—Abrasive size	0.3361	1	0.3361	45.02	<0.0001
AB	0.0049	1	0.0049	0.6564	0.435
AC	0.0012	1	0.0012	0.1641	0.6932
AD	0.04	1	0.04	5.36	0.0409
AE	0.0004	1	0.0004	0.0536	0.8212
BC	0.04	1	0.04	5.36	0.0409
BD	0.0012	1	0.0012	0.1641	0.6932
BE	0.0132	1	0.0132	1.77	0.2101
CD	0.0036	1	0.0036	0.4823	0.5018
CE	0.0256	1	0.0256	3.43	0.091
DE	0.0006	1	0.0006	0.0837	0.7777
A²	0.0788	1	0.0788	10.55	0.0078
B²	0.002	1	0.002	0.2631	0.6182
C²	0.2967	1	0.2967	39.74	<0.0001
D²	0.0005	1	0.0005	0.0733	0.7916
E²	0.1409	1	0.1409	18.88	0.0012
Residual	0.0821	11	0.0075
Lack of fit	0.0664	6	0.0111	3.53	0.0938	not significant
Pure error	0.0157	5	0.0031
Cor total	1.71	31

R2 = 0.99; std. dev. = 0.086; mean = 0.65; C.V.% = 13.32; adeq. precision = 10.98.