A Company is developing cost formulas for management planning and decision making purposes. The company's cost analyst has concluded that utilities cost is a mixed cost, and he is attempting to find a base with which the cost. The controller has suggested that tons mined might be a good base to use in developing a cost formula. The production superintendent she thinks that direct labor-hours would be a better base. The cost analyst has decided to try both bases and has assembled the following information. (b) Determine a cost formula for utilities cost using least-squares regression. Express this cost formula in the form Y = a + bX. (b) Determine a cost formula for utilities cost using least-squares regression. Express this cost formula in the form Y = a + bX