Table 5. Analysis of variance (ANOVA) for fitted models for termite mortality

Source	Sum of squares	df	Mean square	F-value	p-value
Model	1,331.47	9	147.94	11.85	0.0071	Significant
X1	37.07	1	37.07	2.97	0.1454
X2	283.93	1	283.93	22.75	0.005
X3	1.73	1	1.73	0.1386	0.7249
X1.X2	276.72	1	276.72	22.17	0.0053
X1.X3	45.36	1	45.36	3.63	0.1149
X2.X3	0.002	1	0.002	0.0002	0.9903
X12	377.31	1	377.31	30.23	0.0027
X22	362.16	1	362.16	29.02	0.003
X32	7.54	1	7.54	0.6039	0.4723
Residual	62.41	5	12.48
Lack of fit	62.41	3	20.8
Pure error	0	2	0
Cor total	1,393.88	14

R² = 0.955, adjusted R² = 0.875, predicted R² = –0.284, adequate precision = 11.14, SD = 3.53, coefficient of variation = 4.50, and mean = 78.56.
X₁, adhesive concentration (%); X₂, wood vinegar concentration (%); and X₃, ratio of oil palm trunk to Sengon wood sawdust.