Table 3.

Co-efficients of second order polynomial regression models for the various parameters

Co-efficient constant	Hardness	Overall acceptability
Intercept
β0	4.76*	8.50*
Linear
β1	0.15*	0.035
β2	−1.04*	0.34*
Quadratic
β11	0.81*	−0.46*
β22	0.40*	−0.76*
Interactive
β12	0.19*	0.050
R2	0.99	0.98

*Significant (p ≤ 0.05)