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9. Each year a nationally recognized publication conducts its \"Survey of America's Best Graduate and Professional Schools." An academic advisor wants to predict the typical starting salary of a graduate at a top law school using LSAT score of the school as a predictor variable. Total LSAT scores range from 120 to 180. A simple linear regression of SALARY versus LSAT using 25 data points shown below. [30 = -83,761 [31 = 962 s = 3213 R2 = 0.68 df = 24 a) Give a practical interpretation of the estimate of the y-intercept of the least squares line. If none exist explain why. b) Give a practical interpretation of the slope of the least squares line. If none exists explain why. c) Give a practical interpretation of R2 = -63 d) Find r