Table 3. Effects and statistical analysis of variables^a.

Variable	Coefficient	Std. Error	t-Value	p-Value
Intercept	1.3644	0.0054	251.54	<0.0001b
X1	−0.0611	0.0054	−11.27	0.0015b
X2	0.0256	0.0054	4.71	0.0181b
X3	0.0078	0.0053	1.45	0.2439
X4	−0.0161	0.0053	−3.00	0.0579
X5	0.0167	0.0056	2.96	0.0593
X6	−0.0122	0.0053	−2.27	0.1077
X7	0.0067	0.0055	1.22	0.3112
X8	0.0083	0.0055	1.52	0.2260

^aR² = 0.9858, R² (Adj) = 0.9478. ^bStatistical signification at 95% of confidence level (p < 0.05).