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. 
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:
Neuroticism
A personality trait characterized by the tendency to experience negative emotions such as anxiety, anger, or depression.
Extraversion
A personality trait characterized by sociability, talkativeness, assertiveness, and high levels of emotional expressiveness.
Neuroticism
A personality trait characterized by emotional instability, anxiety, moodiness, worry, and sadness.
Unpleasant Emotions
Feelings that are typically described as negative such as sadness, anger, fear, or disgust, which are often a response to undesirable experiences or thoughts.
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