The production of automobile tires in any given year is related to the number of automobiles produced this year and in prior years. Suppose our econometric model resulted in the following data. 
Which variable in the model is the least significant in predicting tire production?
Definitions:
Benign Tumor
A non-cancerous growth in the body that does not invade nearby tissues or spread to other parts of the body.
Cyst
A closed pocket or pouch of tissue that can be filled with air, fluid, pus, or other material.
Overlapping Boundaries
Multiple sites of carcinoma without identifiable borders.
Neoplasms
Abnormal growths of tissue, which can be benign or malignant (cancerous).
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