ases 39) D fixed costs per unit increases =9) The Rock Company used regression analysis to predict the annual cost of utilities. The results were as follows: Utilities Cost Explained by Direct Labor Hours Constant Standard error of Y estimate R-Squared No. of observations Degrees of freedom X Coefficient Standard error of coefficient 2,500 595 0.8650 30 28 2.037 0.917 The variable cost per direct labor hour is A) $595 C) $2.037 B) $2,500 D) none of the above