Exhibit 16.6.Thirty employed single individuals were randomly selected to examine the relationship between their age (Age)and their credit card debt (Debt)expressed as a percentage of their annual income.Three polynomial models were applied and the following table summarizes Excel's regression results. 
Refer to Exhibit 16.6.For the cubic model,Debt = β0 + β1Age + β2Age2+ β3Age3 + ε,the following Excel partial output is available.What is the conclusion when testing the individual significance of Age3?
Definitions:
Pump Division
A designated segment of a business focused on the production or sales of pumps.
Pool Products Division
A segment within a company focused on the development, production, and sales of products related to swimming pools.
Variable Medical Expenses
Costs in healthcare that vary depending on the number and types of services used.
Performance Evaluation
The process of assessing the performance of an individual, group, or entity against established objectives or criteria.
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