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:
Distinctiveness
The quality of being easily distinguishable or set apart from others due to unique features or characteristics.
Appropriateness
Suitability or relevance of a behavior, response, or action in a specific context or situation.
Typicality
The degree to which an object or event is representative of its class, category, or group, affecting how easily and quickly it is recognized and processed.
Id
In psychoanalytic theory, the part of the human psyche that is the source of instinctual impulses and demands for immediate satisfaction of primitive needs.
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