Table 8. ANOVA for RSM Using CCD for the Recovery Process^a.

source	sum of squares	degree of freedom	mean square	F-value	p-value
model	13179.06	5	2635.81	52.0600	0.0003	significant
A	4496.17	1	4496.17	88.8100	0.0002
B	3899.52	1	3899.52	77.0300	0.0003
AB	10.89	1	10.89	0.2151	0.6623
A2	2877.38	1	2877.38	56.8400	0.0007
B2	3292.92	1	3292.92	65.0400	0.0005
residual	253.13	5	50.63
lack of fit	224.94	3	74.98	5.3200	0.1623	not significant
pure error	28.19	2	14.09
total	13432.19	10

^aR² = 0.9812; adjusted R² = 0.9623; and predicted R² = 0.8762.