The production of car tires in any given year is related to the number of cars produced that year and in prior years. Suppose our econometric model resulted in the following data. 
Which variable in the model is the most significant predictor of tire production?
Definitions:
Variable Cost Per Unit
The cost that changes with the level of output or production, expressed on a per unit basis.
Total Fixed Costs
The sum of all costs that remain constant regardless of the level of production or sales volumes.
Volume Levels
Refers to the varying intensities or amounts of sound, production, or activity in a given context.
Scatter Diagram
A graphical representation that displays the relationship between two numerical variables, often used to identify correlations.
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