Given the data - What is the difference between the group means? This can be used to estimate (mu1-mu2). refer to the difference between the two intrusion groups in terms of departure time.   SUBJNUMB SEX RACE NUMINCAR INTRUSN DEPTTIME DAY CARVALUE 1 2 1 3 1 18.3 4 . 2 2 1 2 0 21.82 4 14850 3 2 1 1 0 20.43 4 6750 4 2 1 1 0 26.38 4 7300 5 1 2 1 0 21.32 4 11150 6 2 2 4 1 27.52 4 . 7 1 1 1 1 12.79 4 . 8 2 3 2 0 24.84 4 1825 9 1 2 2 0 26.49 4 1000 10 2 1 1 1 32.16 4 . 11 2 3 4 0 30.1 5 11150 12 2 1 1 0 40.42 5 11275 13 2 2 2 0 35.25 5 4525 14 2 2 1 0 18.9 5 2725 15 1 2 1 0 43.14 5 11475 16 1 3 1 0 19.57 5 3450 17 1 1 1 0 25.41 5 1000 18 1 1 1 0 16.07 5 10150 19 1 1 3 1 42.98 5 . 20 1 1 1 0 14.13 5 17725 21 1 1 2 0 25.46 5 5625 22 2 2 1 0 37.22 5 2300 23 2 1 1 0 22.72 5 6225 24 2 1 1 1 22.93 5 . 25 1 2 2 1 34.38 5 . 26 1 3 3 0 22.91 6 4150 27 1 1 2 0 46.73 6 9075 28 1 1 3 0 26.69 6 14300 29 1 2 1 0 20.77 6 10175 30 2 2 1 1 33.99 6 15550 31 2 2 1 1 50.55 6 1000 32 2 1 2 1 30.6 6 9325 33 2 2 2 0 39.91 6 16825 34 2 1 1 0 24.72 6 3375 35 2 1 1 0 69.68 6 5500 36 1 1 1 0 25.3 7 1075 37 1 2 3 0 14.09 7 4450 38 1 2 2 1 24.01 7 7200 39 2 1 2 0 36.65 7 4300 40 1 3 4 0 22.08 7 6500 41 2 2 3 1 56.06 7 1000 42 2 2 2 0 51.35 7 2300 43 2 2 1 0 69.29 7 5975 44 2 1 2 0 40.51 7 9400 45 1 1 2 0 38.91 7 7250 46 2 2 1 1 24.01 7 5500 47 1 3 2 1 32.59 7 8050 48 1 2 2 0 34.94 7 7725 49 2 1 2 0 36.68 7 10150 50 2 2 2 1 38.33 7 5675 51 2 2 3 1 31.82 7 11475 52 2 1 2 0 37.03 7 6150 53 1 1 2 0 40.42 7 7100 54 1 2 3 0 33.24 7 5650 55 2 1 1 0 55.71 1 5700 56 1 1 2 0 36.74 1 7250 57 1 3 4 0 41.57 1 4300 58 2 1 1 0 15.88 1 2900 59 2 1 1 0 25.15 1 18000 60 2 1 1 1 25.81 1 7025 61 1 1 4 1 56.54 1 10550 62 2 1 1 1 57.97 1 30700 63 2 1 2 1 44.94 1 3350 64 1 1 1 1 20.45 1 12050 65 1 1 1 0 37.52 1 60000 66 1 3 1 0 18.82 1 11050 67 1 1 2 0 29.06 1 1000 68 1 3 2 0 32.21 1 5500 69 2 1 2 0 31.14 1 1300 70 1 2 4 1 36.96 1 4825 71 1 3 8 1 34.59 1 1000 72 1 2 2 1 26.12 1 9050 73 2 1 1 1 20.5 1 7700 74 1 2 2 1 41.24 1 5025 75 2 1 2 0 28.33 3 6600 76 1 2 2 0 35.33 3 6030 77 1 2 2 0 45.24 3 7900 78 1 2 2 0 39.88 3 5300 79 2 1 1 0 20.05 3 5100 80 1 1 2 0 32.46 3 1000 81 2 1 2 0 29.17 3 6050 82 2 2 1 0 30.98 3 1500 83 2 1 1 0 26.84 3 5600 84 1 1 2 1 31.94 3 30700 85 1 3 4 1 33.32 3 8825 86 1 2 1 1 28.94 3 20250 87 2 2 1 1 62.27 3 12525 88 2 3 1 1 40.12 3 14550 89 2 1 2 0 31.1 3 6775 90 2 1 3 0 24.11 3 1900 91 2 1 1 0 35.4 3 5900 92 1 1 2 0 39.41 3 2650 93 1 2 2 0 29.06 3 11000 94 1 1 2 0 55.37 3 5000 95 2 1 1 0 49.54 3 6200 96 2 1 1 0 16.93 3 5600 97 1 1 1 1 41.36 3 5075 98 2 1 1 1 61.24 3 1650 99 2 3 1 1 39.48 3 7250 100 2 1 3 1 113.35 3 8050 101 1 1 2 0 63.54 1 9200 102 2 1 2 0 33.44 1 9100 103 1 2 2 1 23.8 1 6775 104 2 2 2 1 33.54 1 3500 105 2 2 3 0 51.12 1 7400 106 1 1 1 1 37.58 1 10975 107 1 2 2 1 34.66 1 10900 108 1 1 1 0 34.96 1 5000 109 1 1 4 1 73.79 1 5300 110 1 1 2 0 35.71 1 5500 111 1 1 1 0 16.82 1 5050 112 2 2 2 0 32.14 1 12000 113 1 1 2 0 56.79 1 14600 114 2 1 2 0 39.38 1 5500 115 2 1 1 0 35.89 1 7300 116 1 2 2 0 26.3 1 3500 117 1 2 3 0 51.55 1 4700 118 1 1 2 1 25.1 1 6200 119 1 2 2 0 19.23 1 14000 120 2 2 1 1 33.34 1 5400 121 2 1 1 0 14.76 1 6600 122 2 1 1 0 12.75 1 5300 123 2 3 4 0 43.1 1 12100 124 1 1 2 1 18.33 1 4500 125 2 1 1 0 31.52 1 6000 126 1 1 3 1 39.68 1 15200 127 2 2 3 0 46.52 5 3600 128 1 3 1 0 12.52 5 7000 129 1 1 2 0 23.21 5 4400 130 2 2 2 1 34.17 5 7500 131 1 2 2 1 72.23 5 7800 132 2 2 2 0 22.85 5 7800 133 1 2 1 0 19.51 5 3100 134 1 2 2 0 38.21 5 5000 135 1 2 2 1 55.01 5 5600 136 2 2 3 1 43.25 5 20000 137 1 1 2 1 21.32 5 2800 138 2 3 1 1 42.8 5 8400 139 2 1 1 0 35.04 5 10200 140 1 1 2 0 34.91 5 10300 141 1 1 2 0 21.97 5 8000 142 2 1 1 1 28.85 5 2600 143 1 1 1 1 10.61 5 8800 144 1 2 2 1 73.88 5 4200 145 2 1 1 1 19.93 5 9050 146 2 2 1 1 41.29 5 5030 147 2 2 1 0 33.69 5 6900 148 1 3 3 0 40.46 5 1000 149 2 2 2 0 36.32 5 5300 150 1 2 3 0 59.84 5 4000 151 2 1 2 0 36.13 6 6200 152 1 1 2 0 40.24 6 7300 153 1 2 3 0 32.42 6 5470 154 2 1 1 0 51.17 6 6120 155 2 1 1 1 57.48 6 28900 156 2 1 2 1 44.42 6 2390 157 1 1 1 1 20.96 6 5680 158 2 1 1 1 25.34 6 4205 159 1 1 4 1 56.07 6 7480 160 2 2 3 1 34.26 6 11620 161 2 2 2 1 39.38 6 5575 162 1 1 2 0 35.47 6 5895 163 1 3 4 0 41.75 6 3400 164 2 1 1 0 16.98 6 2850 165 2 1 1 0 24.51 6 17560 166 1 1 1 1 32.42 6 7800 167 2 1 1 0 34.08 6 1000 168 1 2 2 1 30.05 6 15270 169 2 1 2 1 36.68 6 9050 170 2 2 1 1 39.76 6 8460 171 2 1 2 0 30.9 6 15600 172 2 1 4 1 35.29 6 17340 173 2 1 3 1 43.17 6 13090 174 2 2 2 0 30.34 6 6230 175 1 2 2 1 40.45 6 3165 176 1 2 1 1 23.76 6 7180 177 1 2 1 0 30.53 6 13290 178 1 2 4 1 20.08 7 6810 179 2 2 3 1 44.3 7 8025 180 1 2 2 0 23.78 7 7050 181 2 1 2 0 39.89 7 16830 182 1 2 1 0 17.98 7 15480 183 1 1 2 0 22.31 7 1690 184 2 1 1 0 24.25 7 1530 185 1 2 2 0 20.19 7 10970 186 2 1 2 0 33.18 7 7405 187 2 2 1 0 18.36 7 6210 188 1 2 2 0 23.12 7 6300 189 2 2 2 0 30.74 7 13670 190 1 1 2 0 28.25 7 16800 191 1 1 1 0 55.08 7 4100 192 1 2 2 0 27.4 7 6420 193 2 1 1 0 20.73 7 6890 194 1 2 3 1 43.12 7 11400 195 2 2 3 1 110.34 7 1000 196 1 2 3 0 35.14 7 4100 197 2 2 2 1 57.72 7 6970 198 2 1 1 0 17.48 7 16420 199 2 2 2 1 37.97 7 9670 200 2 1 1 0 25.04 7 5235