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 slope of the linear equation?
Definitions:
Over-the-counter Medications
Drugs available without a prescription, used to treat common ailments or symptoms.
Drug List
A comprehensive list of medications, often detailing their uses, dosages, and side effects.
Open-ended Question
A type of question that cannot be answered with a simple "yes" or "no" and requires a more detailed response.
Chest Pain
A discomfort or pain felt in the area of the chest, which can be a symptom of various conditions, from heart attack to indigestion.
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