Table 2.

Regression Coefficients, R² and P Or Probability Values For Dependant Variables

Regression coefficient	Thickness (micron)	Tensile Strength (MPa)	Young’s Modulus (MPa)	Elongation at break (%)
b 0	150.90	2.52	25.09	97.92
b 1	5.25*	0.47*	0.19*	4.00*
b 2	−4.32*	0.037	−1.34*	6.30*
b 3	−1.75*	−0.063***	−6.250E−003	0.62
b 12	0.25	0.025	−0.16**	−0.75
b 13	0.000	0.050	−0.21**	−0.25
b 23	0.25	0.025	−0.11	−5.50*
B 11	0.83*	0.027	−0.17*	−3.81*
b 22	0.67***	−0.17*	−0.31*	−1.18
B 33	0.83*	−0.061***	0.059	−2.56*
R 2	0.9869	0.9681	0.9908	0.9589
p or probability	0.0001	0.0001	0.0001	0.0001

Subscripts 1 = SPI concentration, 2 = Plasticizer concentration, 3 = pH

* Significant at 0.01 level

** Significant at 0.05 level

*** Significant at 0.1 level