Below is a partial multiple regression computer output based on a quadratic regression model. 
Test the usefulness of the variable X2 in the model at 
= .05.
Definitions:
Pulmonary Veins
The veins that carry oxygenated blood from the lungs back to the left atrium of the heart.
Systemic Circuit
The part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart.
Right Coronary Artery
An artery supplying blood to the right side of the heart.
Marginal Artery
An artery that runs along the inner border of the colon, providing blood supply to the large intestine.
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