Table 2.

Summary of the results of ANOVA for the observed response (T₈₀).

Response	Source	Sum of Squares	DF	Mean Square	F-Value	p-Value
T80	Model	25.11574	7	3.587962	23.97947	0.012
	$x_1$	2.04674	1	2.04674	13.679	0.034 *
	$x_2$	0.747528	1	0.747528	4.995965	0.111
	$x_3$	17.25884	1	17.25884	115.3462	0.002 *
	$x_1{x}_2$	1.774022	1	1.774022	11.85634	0.041 *
	$x_1{x}_3$	0.195791	1	0.195791	1.308532	0.336
	$x_2{x}_3$	0.049017	1	0.049017	0.327598	0.607
	$x_1{x}_2{x}_3$	3.043797	1	3.043797	20.34265	0.020 *
	Residual	0.448879	3	0.149626
	Lack of Fit	0.02397	1	0.02397	0.112822	0.769
	Pure Error	0.42491	2	0.212455
	Cor Total	25.56461	10

*, p < 0.05.