Table 5

	Effect	Coefficient	Standard Error	*F-Value*	p-Value
Intercept		68.618	0.5076	135.17	0
A-A	-1.704	-0.852	0.5076	-1.68	0.235
B-B	-2.425	-1.213	0.5076	-2.39	0.14
C-C	-4.612	-2.306	0.5076	-4.54	0.045^a
D-D	0.564	0.282	0.5076	0.56	0.635
E-E	7.724	3.862	0.5076	7.61	0.017^a
F-F	6.127	3.064	0.5076	6.03	0.026^a
G-G	-1.372	-0.686	0.5076	-1.35	0.309
H-H	-3.401	-1.701	0.5076	-3.35	0.079
I-I	-10.036	-5.018	0.5076	-9.88	0.010^a

Pred-R²=0.9915 Adj-R²=0.953; ^a5% significance level. A–I symbols are shown in Table 1.

Table 5: Effects of the variables and statistical analysis of the Plackett-Burman design.