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Table 6 Regression coefficients and significance of response surface quadratic

From: Brette Pearl Spar Mable (BPSM): a potential recoverable catalyst as a renewable source of biodiesel from Thevetia peruviana seed oil for the benefit of sustainable development in West Africa

Term Effect Coefficient Standard Error Coefficient 95% CI
Low
95% CI
High
P-Value T-Value VIF
Constant - 27.385 0.1330 27.083 27.686 0.000 205.54 -
X1 12.000 6.000 0.0981 5.7782 6.2218 0.000 61.19 1.00
X3 0.000 0.000 0.0981 -0.2218 0.2218 1.000 0.00 1.00
X12 11.154 5.577 0.1440 5.251 5.902 0.000 38.75 1.01
X32 -0.846 -0.423 0.1440 -0.749 -0.098 0.016 -2.94 1.01
X1X3 -11.000 -5.500 0.1390 -5.814 -5.186 0.000 -39.66 1.00