The coded coefficient is indeed lower for cutting speed than the cutting angle, which suggests that the cutting angle has a stronger effect on the tool age.
The coefficient of the metal hardness is positively related to the tool age output, as indicated by the plot. This makes sense from an engineering perspective.
The factorial plot clearly shows that the cutting speed has a significant impact on the tool age. Increasing the cutting speed from low to high level increases the tool age.
Lennie
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