One possible model for the manufacturing process of Exercise 17 is the following:

Dependent variable is: Log(Cost per unit)

R squared = 90.1% R squared (adjusted) = 89.3%

s = 0.0841 with 15 - 2 = 13 degrees of freedom Variable Coefficient SE(Coeff) t-ratio P-value Intercept 0.7618 0.0405 18.8 60.0001

#Units -0.0041 0.0004 -10.9 60.0001 Using this model, predict the cost per unit in a batch of 300.