Table 2.

Regression coefficients for TAC of saffron tepal extract in quadratic model with MAE

Term	Coefficient	Standard error for the coefficient	F value	p value
Intercept	72.64	11.76
Block 1	−2.44
Block 2	2.44
X 1‐time	−0.42	1.68	0.664	0.8080
X 2‐temperature	−2.70	1.68	2.60	0.15
X 3‐solvent ratio	23.89	1.68	203.07	<0.0001
$x_1^2$	−1.78	1.51	1.39	0.2768
$x_2^2$	−3.65	1.51	5.83	0.0465
$x_3^2$	3.94	1.51	6.8	0.0350
X 1 X 2	1.33	2.37	0.31	0.5923
X 1 X 3	−0.24	2.37	0.011	0.9206
X 2 X 3	−0.77	2.37	0.11	0.7541