2. Table 1 below shows linear regression results. Based on the confidence level, interpret whether reject the null hypothesis, and the statistical significance of estimated coefficients for X1, X2, and X3, respectively. (6) Coef. Std error [0.025 0.975] Intercept 3.51 0.42 2.3 3.9 X1 0.05 0.01 0.05 0.07 X2 -0.25 0.06 -0.22 0.19 X3 -0.01 0.09 -0.02 0.02