6. To study factors that affect the recurrence of heart attacks (HA), an investigator collected data from 20 HA victims. The investigator fit a logistic regression model with an indicator of a second HA within one year (1 = HA; 0 = no HA) as the binary outcome. There are two predictors: x1 = 1 if the patient completed an anger management program; 0 otherwise x2 = anxiety score (0 = low anxiety, 100=high anxiety) Use the cut-off value 5% when it applies. The logistic regression output is given as follows: Estimate Std. Error z value Pr(>Izl) Intercept -6. 36347 3.21362 -1.980 0. 0477 x1 -1. 02411 1. 17101 -0.875 0. 3818 x2 0. 11904 0. 05497 2. 165 0. 0304