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:
Self-esteem
Self-esteem refers to an individual's subjective evaluation of their own worth or value.
Authentic Self
Represents one's true, genuine identity, encompassing personal values, beliefs, and feelings.
Public Self
An image presented to others in social interactions.
Self-Conscious
The state of being overly aware of oneself, one's appearance, or actions, often leading to discomfort or awkwardness.
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