Engine Wear
To compare the wearing of two types of automobile engines,1 and 2,an experimenter chose to "pair" the measurements,comparing the wear for the two types of engines on each of 7 automobiles,as shown below. 
-{Engine Wear Narrative} Estimate with 90% confidence the mean difference and interpret.
Definitions:
Perfectly Competitive
A market structure where many firms offer products or services that are similar, leading to no single firm having significant market power.
Total Market
The total market refers to the entire demand for a specific good or service within a given geographic area or industry.
Market Price
The current price at which an asset or service can be bought or sold in the marketplace.
Deadweight Loss
A dip in economic optimization that happens when the equilibrium of a good or service in the free market is not realized.
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