15 Assighment Production Volume (units) Total Cost ($) 400 4,500 450 5,500 550 5,900 600 6,400 700 6,900 750 7,500 a. Use these data to develop an estimated regression equation that could be used to predict the total cost for a given production volume. Do not round intermediate calculations " | Compute b; and by (to 1 decimal). Do not round intermediate calculations. by | by | Complete the estimated regression equation (to 1 decimal). Do not round intermediate calculations. 7 4 T i b. What is the variable cost per unit produced (to 2 decimal)? Do not round intermediate calculations.