Hammer Company is accumulating data to use 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 the use of linear regression to derive an equation for maintenance hours and costs. Data regarding the maintenance hours and costs for the last year and the results of the regression analysis follow Month 44 January February March April May June July August September October November December Maintenance Cost Machine Hours $ 4,370 860 3,950. 700 4,550 780 3,770 680 5,300 880 3,910 690 3,980 700 5,420 1,000 5,210 870 5,000 850 4,250 730 4,110 720 $ 53,820 9,460 $ 4,485 $ 788 $ 6.00 Sum Average Average cost per hour a (intercept) b (coefficient) Standard error of the estimate R-squared t-value for b $196.32 5.4402 235.1136 0.85919 7.8111 Based on the data derived from the regression analysis, 420 maintenance hours in a month mean that maintenance costs should be budgeted to the nearest dollar at