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

Using this model, predict the cost per unit in a batch of 300.

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Variable Intercept #Units Coefficient SE(Coeff) tratio P-value <0.0001 <0.0001 0.7618 0.0405 18.8 -0.0041 0.0004 -10.9