Suppose we need to predict the cost of maintenance for Brush Prairie High School for the upcoming school year. From the school district records, we gather weekly data about costs and volumes for two potential cost drivers: labour hours used in the maintenance department and number of enrolled students. Potential Cost Drivers Number of Total Maintenance Number Maintenance Hours of Week Cost Worked Students 1 $ 16,690 238 534 2 13,560 194 532 3 13,540 108 534 4 16,060 229 530 5 12,430 101 533 6 20,860 298 537 7 18,420 244 540 8 00 12,310 98 540 9 13,770 108 541 10 16,990 225 538 11 20,650 289 540 12 14,770 118 539