Statistics for Business: Decision Making and Analysis, 3rd Edition

... whether or not extra detail work is required	2
Rush	whether or not the job was a rush order	2
Manager	supervising production manager	5
Music	type of music played during production	3
Shift	day or night shift	2
Plant	new or old plant	2

$$\text{Total} \text{Metal} \text{Cost}=\left(\text{Weight} \text{Final}+\text{Weight} \text{Rem}\right)$$

$$\left(\text{Cost} \text{Metal/Kg}\right)$$

Figuring that breakdowns introduce a fixed cost (that is, there is a fixed cost per breakdown rather than per unit), they also added the variable Breakdown/Unit. Finally, conversations with employees suggested that work slowed down if a plant got too hot or too cold. So they added the variable

$$\text{Sq} \text{Temp} \text{Deviation}={\left(\text{Room} \text{Temp}-75\right)}^2$$

Sq Temp Deviation gets larger the farther room temperature drifts from 75 degrees. When combined with the variables listed in ...