The McGraw Company is accumulating data to be used in preparing its annual profit plan for the coming year . The cost behavior pattern of the maintenance costs must be determined. The accounting staff has suggested that linear regression be employed to derive an equation in the form of y = a + bx for maintenance costs. Data regarding the maintenance hours and costs for last year and the results of the regression analysis are as follows: (CMA adapted) Danuary February March April May June July August September October November December Sum Average Hours of Activity 599 460 580 42e 720 470 460 750 700 670 520 500 6,840 570 Maintenance Costs $ 4,380 3) 180 3,280 3,000 4,530 3,140 3,210 4,65e 4,440 4,230 3,482 3,340 $ 45,368 3,788 792.17 5.2418 254.567 0.43845 A coefficient B coefficient Standard error of the a coefficient Standard error of the b coefficient Standard error of the estimate R2 T-value a T-value b 167.762 8.93461 3.112 11.955 HOT Save & LX R2 T-value a T-value b 8.93461 3.112 11.955 What is the fixed cost per month using the high-low method to estimate the cost equation? Multiple Choice $1,800 $3.550 $940 O $900