Table 3.

S/N response values.

	S/N Ratio Average
	Level 1	Level 2	Level 3
A	−10.26	0.04	−7.36
B	−3.36	−9.67	−4.54
C	−14.42	−5.11	1.95
D	−14.42	−5.11	1.95
E	−8.20	−11.95	2.58