A sales manager for an advertising agency believes there is a relationship between the number of contacts and the amount of the sales.To verify this belief,the following data was collected: 
What is the value of the standard error of estimate?
Definitions:
Stability
The state or quality of being stable; firmness in position.
Deprivation
The lack or denial of something considered to be a necessity, such as food, shelter, or emotional comfort.
Physical Needs
Basic requirements necessary for physiological well-being, such as food, water, shelter, and sleep.
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