Sympco Glass manufactures insulated windows. The firms repair and maintenance (R&M) cost is mixed and varies most

Sympco Glass 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 (a) or to (b) provide the better estimate of the relationship between repairs and maintenance costs and machine hours?Why?

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Month MHs R&M Cost May June Ju August September October November December 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 9,525 11,670