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:
Carboxypeptidase
An enzyme that breaks down proteins by hydrolyzing the peptide bonds at the carboxyl end of the protein.
Microvilli
Minute projections from the surface of some cells, increasing surface area and facilitating absorption, such as in the intestines.
Goblet Cells
Epithelial cells found in the respiratory and intestinal tracts that secrete mucus to lubricate and protect the linings.
Small Intestine
The part of the gastrointestinal tract between the stomach and the large intestine, where most of the digestion and absorption of food takes place.
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