A consumer is interested in investigating the difference in price between regular and premium gasoline at major filling stations in the U.S.A..An independent,random sample of stations is chosen and the prices per gallon are recorded for regular and premium gasoline.A histogram or Normal probability plot of the differences would be needed to verify the Nearly Normal Condition. 
Definitions:
Self-esteem
An individual's sense of their own value and worth.
Belief
The acceptance that something exists or is true, especially without proof.
Worth
The value or importance of something, often in terms of monetary, social, or personal significance.
Nature
The inherent qualities or characteristics of something; can also refer to the physical world and its organisms, landscapes, and processes not made by human beings.
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