Waintenance Month Cost Jan. $ 5,150 Feb. 3,950 Mar. 4,550 Apr 3, 770 May 5,300 June 3,910 July 3,980 Aug 5. 420 Sept. 5,210 Oct. 5,000 Nav. 4,250 Dec 4. 110 Sum $54,000 Aversi $ 4,550 Average cost per hour a intercept) b (coefficient) Standard error of the estimato R-squared t-value for Machine Hours 860 700 780 680 880 690 700 1.000 870 850 730 720 9.460 $ 788 $ 6,00 $-125.3539 5.9307 171.8873 0.9314 11.6430 Use the high-low method to generate the equation to estimate future maintenance costs (Do not round Intermediate calculations.)