Table 4. Values of the regression coefficients calculated for milk beverage supplemented with coffee

Response variables1)	Independent variable	Regression coefficient	Standard error coefficient	t-value	Significance (p)
Y1	Constant	201.539	17.29	1.1658	0.000
	Linear
	X1	−12.267	17.00	−0.722	0.494
	X2	5.906	17.00	0.347	0.738
	Quadratic
	X12	22.763	25.05	0.909	0.394
	X22	−29.220	25.05	−1.166	0.282
	Interaction
	X1X2	10.467	20.82	0.503	0.631
Y2	Constant	31..0339	1.253	24.767	0.000
	Linear
	X1	−1.4056	1.232	−1.141	0.291
	X2	1.6389	1.232	1.330	0.225
	Quadratic
	X12	0.6630	1.816	0.365	0.726
	X22	−2.8704	1.816	−1.581	0.158
	Interaction
	X1X2	1.4500	1.509	0.961	0.369