In order to estimate the difference between the average mortgages in the southern and the northern states of the United States, the following information was gathered. 
a.Compute the degrees of freedom for the t distribution.
b.Develop an interval estimate for the difference between the average of the mortgages in the South and North. Let Alpha = 0.03.
Definitions:
Fixed Manufacturing Overhead
The set of production costs that do not change with the level of production, including salaries, rent, and insurance of the factory.
Direct Labor
The labor costs directly attributed to the production of goods, including wages of workers who are actively involved in the manufacturing process.
Raw Material
The basic materials from which a product is made, used in the manufacturing or production process.
Work in Process
Partially finished goods that are still undergoing manufacturing processes but are not yet complete products.
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