Optimization of Ultrasound-Assisted Extraction of Polyphenol Content from Zea mays Hairs (Waste)

Table 5

Analysis of variance (ANOVA) for the second-order model correlating the content of phenolic compounds with the experimental variables.

Source	Sum of squares	Degree of freedom	Mean square	value
Regression	56823.57	9	6313.73	<0.01
Residual	2115.23	16	132.20	—
Validity	2115.53	3	705.06	—
Pure error	0.00378	13	0.029	—
Total	5893.74	25	—	—

R² = 0.964; R²_Adj = 0.944; R²_pred = 0.908.