Education reform is one of the most hotly debated subjects on both state and national policymakers list of socioeconomic topics, Consider a linear regression model that relates school expenditures and familly background to student performance in Massachus using 224 school districts. The response variable is the mean score on the MCAS (Massachusetts Comprehensive Assessment System) exam given to 10th graders. Four predictor variables are used: (1) STR is the student-to-teacher ratio in % (2) TSAL is the average teacher's salary in $1.000s, (3) INC is the median household income in $1,000s, and (4) SGL is the percentage of single-pa households. A portion of the data is shown in the accompanying table, Score 227.00 230.67 STR 19.00 17.90 1 19.20 TSAL 14.01 40.17 INC 48.89 43.91 SGL 4.70 4.60 1 5.10 230.67 44.79 47.64 Click here for the Excel Data File a. For each predictor variable, discuss whether it is likely to have a positive or negative influence on Score Effect On Score Predictor Variable STR TSAL INC SGL E F D INC B 1 Score STR 2 227.00 19.00 3 230.67 17.90 4 233.33 17.50 5 240.00 17.10 6 233.33 16.80 7 240.00 17.30 8 225.33 20.50 9 236.33 15.60 10 227.00 15.50 11 230.00 11.40 12 227.67 17.60 13 241.67 14.80 14 236.33 17.90 15 226.33 19.60 16 243.67 17.30 17 230.00 17.00 18 233.67 19.30 19 216.33 27.00 20 233.00 18.70 21 235.00 17.10 22 217.33 19.10 23 242.00 15.80 24 235.00 13.50 25 228.00 13.90 26 233.33 16.90 27 225,33 17.60 28 232.67 12.00 29 237.00 17.20 30 220.33 21.00 31 220.67 17.10 32 227.00 18.50 33 244.67 15.70 34 231.33 16.90 35 230.33 17.60 36 230.33 16.60 10 MCAS TSAL 44.01 40.17 36.62 47.98 45.50 40.56 40.51 44.80 29.86 29.11 44.33 43.93 35.53 42.81 49.56 40.65 36.64 46.48 40.56 47.58 46.21 45.06 47.44 50.45 45.79 42.41 44.65 46.96 41.12 37.38 38.80 43.07 45.35 34.88 42.07 48.89 43.91 44.55 70.76 52.75 57.05 43.25 46.00 49.57 32.94 40.30 64.54 44.00 50.68 61.05 48.04 53.30 34.38 38.41 51.92 38.54 61.80 60.32 39.99 62.47 41.99 36.96 59.37 29.04 35.56 40.14 74.31 51.51 39.76 52.55 SGL 4.70 4.60 6.80 4.00 3.30 4.60 5.80 3.50 4.00 7.40 6.20 3.50 5.80 4.80 3.10 5.90 3.90 9.00 5.10 4.10 10.60 3.70 4.30 5.70 3.20 5.30 2.50 4.10 13.40 7.20 5.90 3.30 4.20 4.50 4.60 A AA 10 A1 X Score F B 36 230.33 16.60 37 227.33 16.10 38 230.00 17.60 39 241.67 18.00 40 231.00 19.30 41 226.00 15.80 42 235.67 17.90 43 232.33 19.40 44 223.33 17.80 45 222.67 16.60 46 219.00 16.70 47 227.33 18.50 48 221.67 19.20 49 232.67 17.30 50 232.00 14.90 51 233.67 14.00 52 227.33 19.80 53 234.00 17.00 54 228.33 17.30 55 240.33 15.10 56 228.33 15.70 57 238.67 16.50 58 239.33 16.70 59 243.00 16.70 60 240.00 15.60 61 239.33 14.20 62 225.00 21.40 63 241.33 16.90 64 226.00 21.30 65 238.33 17.80 66 217.00 16.40 67 231.67 17.90 68 239.67 17.40 69 231.00 17.40 70 226.67 16.30 71 234.33 16.70 BE 10 MCAS 42.07 36.97 44.83 48.01 46.54 37.74 40.58 46.56 40.03 38.98 39.13 44.45 37.15 43.53 35.08 41.00 36.14 38.33 37.22 42.72 34.34 32.65 46.58 41.87 42.91 31.91 40.52 50.97 43.92 37.38 38.39 43.45 41.10 43.10 45.65 43.39 AE D 52.55 43.40 48.51 68.58 47.46 39.83 47.45 56.79 37.40 36.51 28.97 40.66 33.36 52.51 53.27 54.63 35.43 50.93 39.83 47.40 35.36 44.82 59.47 47.48 35.04 46.82 43.21 66.39 43.95 62.71 29.37 51.12 62.26 51.70 42.73 52.28 AN E 4.60 4.30 4.70 4.60 5.20 5.20 3.80 4.00 6.60 4.50 9.10 6.70 8.90 5.20 5.20 4.40 7.50 3.40 5.60 4.40 8.80 2.60 2.90 3.60 4.40 3.20 7.30 3.70 4.40 3.90 15.90 4.50 3.40 4.10 6.50 4.70 Ready Type here to search 70 226.67 16.30 71 234.33 16.70 72 215.33 21.40 73 236.33 13.30 74 230.67 18.40 75 246.33 14.50 76 223.00 20.80 77 245.00 15.40 78 235.67 16.00 79 238.67 15.20 80 221.33 21.50 81 225.00 18.00 82 231.67 19.10 83 220.00 20.50 84 237.33 16.30 85 226,67 18.40 86 237.00 14.50 87 234.00 17.50 88 242.33 16.00 89 232.33 17.90 90 232.00 16.80 91 225.33 18.20 92 231.33 17.20 93 247.00 16.60 94 222.00 16.30 95 240.00 17.40 96 232.33 17.30 97 224.33 21.50 98 227.67 21.60 99 231.67 13.10 100 235.67 19.60 101 230.67 19.00 238.00 18.80 103 233.33 18.30 104 232.33 8.90 105 239.33 17.00 11 The MCAS 45.65 43.39 44.25 40.16 39.51 41.95 38.35 55.10 41.38 43.91 41.72 40.31 44,07 42.93 48.42 46.75 40.04 38.51 38.87 48.76 41.62 39.76 41.27 46.79 43.53 41.94 45.00 39.18 42.67 41.22 46.55 45.55 41.04 39.98 37.00 45.95 42.73 52.28 26.40 42.36 46.70 44.23 41.93 76.41 55.31 70.13 35.14 40.91 49.63 35.83 64.20 42.10 66.02 53.78 65.02 47.31 55.52 34.59 50.87 73.52 45.53 59.86 53.87 44.90 41.42 45.28 45.13 54.77 61.96 39.60 49.21 56.00 CA 6.50 4.70 17.40 5.40 4.30 3.60 5.40 3.10 3.70 2.80 10.60 3.80 3.30 10.20 2.40 5.60 4.00 5.30 3.30 5.10 5.30 7.20 5.10 2.90 4.00 4.80 3.70 5.80 8.20 6.50 4.50 4.10 3.20 4.50 3.80 3.50 102 Ready