Green Shade manufactures insulated windows. The firm's repair and maintenance (R&M) cost is mixed and varies most directly with machine hours worked. The following data have been gathered from recent operations:

a. Use the high–low method to estimate a cost formula for repairs and maintenance.
b. Use least squares regression to estimate a cost formula for repairs and maintenance.
c. Does the answer to part (a) or to part (b) provide the better estimate of the relationship between repairs and maintenance costs and machine hours?Why?

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Month R&M Cost May June July August September October November December MHs 1,400 1,900 2,000 2,500 2,200 2,700 1,700 2,300 $9,000 10,719 10,900 13,000 11,578 13,160 9525 11,670