The following information regarding the number of semester hours taken from random samples of day and evening students is provided. 
Develop a 95% confidence interval estimate for the difference between the mean semester hours taken by the two groups of students.
Definitions:
Cournot Model
An economic model that describes an industry structure in which companies compete on the quantity of output they will produce, assuming that each firm's output decision affects the market price.
Perfectly Competitive
A market structure characterized by a large number of small firms, a homogenous product, and free entry and exit, leading to price taking behavior.
Price-leadership Model
An economic concept where one or more dominant firms set their prices, and other, smaller firms in the industry then follow by setting the same or similar prices.
Dominant Firm
A company that holds a large portion of the market share within its industry, exerting significant influence or control over market conditions, including prices and product offerings.
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