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In the regression model Y = $150,000 + $30X, Y is total Repairs & Maintenance (R&M) cost and X is machine hours. The above equation implies that an
A. increase of 1 machine hour is associated with an increase of $30,000 in total R&M cost.
B. increase of 1 machine hour is associated with an increase of $30 in total R&M cost.
C. increase of 20 machine hours is associated with an increase of $120,000 in total R&M cost.
D. increase of 20 machine hours is associated with an increase of $60,000 in total R&M cost.
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