Simultaneous Voltammetric Determination of Ascorbic Acid, Paracetamol, and Caffeine Using Electrochemically Reduced Graphene-Oxide-Modified Electrode

Table 2

Analysis of variance for the fitted quadratic polynomial model of the preparation of ErGO/GCE.

Source	DF	SS	MS	value
Regression	9	2.52569	0.280632	0.000
Residual	50	0.02975	0.000595	—
Lack of fit	3	0.00048	0.000160	0.856
Pure error	47	0.02927	0.000623	—

DF: degrees of freedom; SS: sum of squares; MS: mean of squares.