The following scatterplot shows monthly sales figures (in units) and number of months of experience on the job for a sample of 18 salespeople. 
a. Describe the association between monthly sales and level of experience.
b. Do these data satisfy the conditions for computing a correlation coefficient? Explain.
c. Estimate the correlation.
Definitions:
College Grades
The grading system used in higher education to measure and record students' academic performance.
Efficient Economy
An economy that optimally allocates its resources, producing the maximum amount of goods and services possible from its input resources.
Consumers Demand
The desire of purchasers, consumers, or clients for a particular commodity or service supported by purchasing power.
Least Possible Cost
The minimum expenditure necessary to achieve a specific outcome or procure a good or service, often used in the context of production or economic theory.
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