2 Consider a SLRM relating the annual number of crimes on college campuses (crime) to student enrollment (enroll) with the following estimation results: log(crime), = -6.63 + 1.27log(enroll); n = 97 R2 = 0.585 (1.03) (0.11) a- Interpret the estimated slope coefficient. b- Calculate two-tailed test to find whether the variable enroll should be included in the regression model (at 1% significance level). c- Test whether the model is useful at 5% significance level