Table 6: Statistical parameters for 23 design.

TermEffectCoefficientStandard error coefficient

Constant21.790.328766.290.010
A −20.74−10.120.3287−30.780.021
B 21.1710.590.328732.200.020
C −12.93−6.470.3287−19.670.032
AB −10.92−5.460.3287−16.600.038
AC 6.953.470.328710.570.060
BC −5.55−2.780.3287−8.440.075
S 0.929845
R-Sq 99.96%
R-Sq (adj)99.75%