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The Hard Rock Mining Company wants to separate its utilities cost into variable and fixed elements for planning purposes. The controller believes tons mined might

The Hard Rock Mining Company wants to separate its utilities cost into variable and fixed elements for planning purposes. The controller believes tons mined might be a good base for developing a cost formula. The production superintendent disagrees; she thinks direct labor-hours would be a better base. Quarterly data for tons mined, direct labor-hours, and utilities cost are as follows:
Quarter Tons Mined Direct Labor-Hours Utilities Cost
Year 1:
First 19,0005,400 $ 54,000
Second 14,0003,400 $ 49,000
Third 24,0004,400 $ 64,000
Fourth 16,0006,400 $ 79,000
Year 2:
First 22,00010,800 $ 120,000
Second 29,00010,200 $ 125,000
Third 34,0008,800 $ 89,000
Fourth 32,00011,800 $ 128,000
1-b. Using the least-squares regression method, estimate the variable utilities cost per ton mined and the total fixed utilities cost per quarter. Express these estimates in the form Y = a + bX.
Note: Round the Variable cost per unit to 2 decimal places and Fixed Cost to the nearest whole dollar amount.

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