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:
Mistake
An error about some aspect of a contract that destroys consensus.
Contract
An agreement between two or more parties that is legally binding and creates reciprocal obligations that can be enforced by law.
Wallpaper
Decorative material used to cover and adorn the interior walls of homes, offices, and other buildings.
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A device or system for recording incoming telephone messages when the recipient is unable to answer the phone.
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