Table 4.

ANOVA for the selected factorial model.

Source	Sum of Squares	df	Mean Square	F Value	p-Value Prob > F
Response 1—Fiber diameter
Model	359,000	3	120,000	32.97	<0.0001 *
X1—Shellac content	161,000	1	161,000	44.49	<0.0001 *
X3—Applied voltage	97,320.85	1	97,320.85	26.85	0.0001 *
X1X3	99,939.92	1	99,939.92	27.58	<0.0001 *
Residual	54,362.18	15	3624.15
Lack of Fit	53,643.40	13	4126.42	11.48	0.0829 **
Pure Error	718.78	2	359.39
Cor Total	413,000	18
R2 = 0.8683    Adj R2 = 0.8420    Pred R2 = 0.8274
Response 2—Bead-to-fiber ratio
Model	53.90	3	17.97	64.62	<0.0001 *
X1—Shellac content	29.81	1	29.81	107.22	<0.0001 *
X4—Feed rate	11.83	1	11.83	42.56	<0.0001 *
X1X4	12.25	1	12.25	44.06	<0.0001 *
Residual	4.17	15	0.28
Lack of Fit	4.13	13	0.32	16.47	0.0587 **
Pure Error	0.04	2	0.02
Cor Total	58.07	18
R2 = 0.9282    Adj R2 = 0.9138    Pred R2 = 0.9016

Significant * p < 0.01; not significant **.