A company has developed a linear trend model to forecast monthly sales. The following data show the actual sales and the "fitted" sales for months 1-12. 
Based on these data, what is the mean square error for the linear trend model?
Definitions:
Systolic Pressures
The pressure in the arteries when the heart beats and fills them with blood, representing the top number in a blood pressure reading.
Systemic Circuit
A part of the cardiovascular system that carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart.
Capillaries
Microscopic blood vessels that facilitate the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and tissues.
Diastolic
Pertaining to diastole, which is the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
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