Table 2.

Regression coefficients and their significances in the second-order polynomial regression equation.

	Coefficient	Standard Error	t Value	p Value
(Tyrosinase Inhibition)
Intercept	52.96	1.707	31.032	<0.001
X1	−6.868	1.045	−6.571	0.001
X2	0.883	1.045	0.844	0.437
X3	−1.943	1.045	−1.859	0.122
$X_1^2$	−19.69	1.538	−12.8	<0.001
$X_2^2$	2.015	1.538	1.31	0.247
$X_3^2$	−1.755	1.538	−1.141	0.306
X1X2	0.04	1.478	0.027	0.979
X1X3	0.16	1.478	4.168	0.009
X2X3	−0.315	1.478	−0.213	0.84
(Antioxidant Activity)
Intercept	47.473	1.15	41.534	<0.001
X1	−8.663	0.704	−12.306	<0.001
X2	-0.75	0.704	−1.065	0.335
X3	−2.723	0.704	−3.868	0.012
$X_1^2$	−22.884	1.036	−22.086	<0.001
$X_2^2$	−2.089	1.036	−2.016	0.1
$X_3^2$	−3.889	1.036	−3.754	0.013
X1X2	0.9	0.996	0.904	0.407
X1X3	1.755	0.996	1.763	0.138
X2X3	1.8	0.996	1.808	0.13