Hours of Activity 540 see 630 460 789 510 January February March April May June July August September October November December Sum Average Maintenance Costs 4,420 3,220 3,820 3,840 4,578 3,189 3,250 4,690 4,480 4,270 3,520 3,388 45,840 3,828 see 810 760 730 560 540 7,320 610 1,146.03 4.3836 A coefficient B coefficient Standard error of the a coefficient Standard error of the b coefficient Standard error of the estimate 454.871 0.73148 R2 306.174 0.78220 2.519 5.993 T-value a T-value b What would be the cost equation if the high-low method is used? Multiple Choice O Maintenance Costs = $621 Hours of Activity Maintenance Costs - $3,820 + (5610 Hours of Activity: O Maintenance costs $873. ($471 Hours of Activity) Maintenance Costs - $306.174. ($0.78220 Hours of Activity