The following data present the number of computer units sold per day by a sample of 6 salespersons before and after a bonus plan was implemented. 
At 95% confidence, test to see if the bonus plan was effective. That is, did the bonus plan actually increase sales? Let d = Before - After.
Definitions:
Macroeconomics
The branch of economics that studies how the overall economy—the market systems that operate on a large scale—behaves and functions.
Nationwide Market
A market that spans an entire country, allowing for the distribution and sale of goods and services across all regions.
Scientific Method
The procedure for the systematic pursuit of knowledge involving the observation of facts and the formulation and testing of hypotheses to obtain theories, principles, and laws.
Human Behavior
The study of how individuals act and make decisions in various environments and situations.
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