Clough Company Is Interested in Establishing the Relationship Between Utility

Clough Company is interested in establishing the relationship between utility costs and machine hours.Data have been collected and a regression analysis prepared using Excel.The monthly data and the regression output follow:
$\begin{array}{|l|r|r|}\hline \text { Month } & \text { Machine } & \text { Electricity } \\& \text { Hours } & \text { Costs } \\\hline \text { January } & 3,250 & 22,080 \\\hline \text { February } & 3,770 & 25,200 \\\hline \text { March } & 2,470 & 16,200 \\\hline \text { April } & 4,030 & 27,600 \\\hline \text { May } & 4,940 & 33,900 \\\hline \text { June } & 4,290 & 26,400 \\\hline \text { July } & 5,330 & 29,700 \\\hline \text { August } & 4,560 & 27,300 \\\hline \text { September } & 2,600 & 18,600 \\\hline \text { October } & 4,810 & 31,200 \\\hline \text { Nowember } & 6,110 & 37,200 \\\hline \text { December } & 5,460 & 33,300 \\\hline\end{array}$

Required:
(a. )What is the equation for utility costs using the high-low method?
(b. )Prepare an estimate of utility costs for a month when 3,000 machine hours are worked.