24. Given a regression cost function, y = 10 + 2x with a standard error of 53.40 and represen activity of direct labor hours, what is the estimated cost when - 152 a. b. $7.80 $15.60 c. $40.00 d. $80.00 25. Refer to the preceding question. What is the 95% pre er to the preceding question. What is the 95% prediction interval, using the non-precise discussed in class, for the true cost when the number of direct labor hours is 1ST a. $46.80