Table 2.

Analysis of variance table.

Source	Sum of squares	Degree of freedom	Mean square	F value	p-value Prob > F
Model	1404.8	9	156.09	7.09	0.0086*
X1	1.7385	1	1.7385	0.08	0.7869
X2	89.084	1	89.084	4.04	0.0843
X3	147.18	1	147.18	6.68	0.0362*
X1X2	566.86	1	566.86	25.73	0.0014*
X1X3	7.1683	1	7.1683	0.33	0.5862
X2X3	39.087	1	39.087	1.77	0.2246*
X12	498.47	1	498.47	22.63	0.0021*
X22	182.29	1	182.29	8.27	0.0238*
X32	95.668	1	95.668	4.34	0.0757

R² = 0.9011, Adj-R² = 0.7739.

*Statistically significant at 95% probability level.