Table 2.

Coefficients for the regression model for process parameter and product response

Parameters	Product response
	Bulk density	Expansion ratio	Hardness	Crispiness
Intercept	0.58	2.57	25.14	12.51
X1-Screw speed	−0.05٭٭٭	0.07	−2.47٭	0.61
X2-Feeder speed	0.02	−0.03	3.10٭
	−1.01٭
X3-Temperature	−0.20٭٭٭	0.74٭٭٭	−10.22٭٭٭
	3.16٭٭٭
X1X2	1.25 × 10−3	0.09	Nil	−0.37
X1X3	0.01٭	−0.19٭	Nil	0.38
X2X3	−0.02	0.09	Nil	0.38
X21	−0.05٭	0.16٭٭
	Nil	−0.25
X22	−0.11	−0.06	Nil	−0.25
X23	−9.24 × 10−3	0.32٭٭٭	Nil	−0.25
R2	0.95	0.98	0.91	0.93

X₁- Screw speed, X₂ - Feeder speed, X₃ -Temperature

Significant at P < 0.05

Significant at P < 0.01

Significant at P < 0.001