In order to estimate the difference between the average daily sales of two branches of a department store, the following data has been gathered. 
a.Determine the point estimate of the difference between the means.
b.Determine the degrees of freedom for this interval estimation.
c.Compute the margin of error.
d.Develop a 95% confidence interval for the difference between the two population means.
Definitions:
Ownership
The legal right or state of having control over property, assets, or an entity.
Qualifying Assets
Assets that necessitate a substantial period of time to get ready for their intended use or sale, as defined by certain accounting standards.
Investment Properties
Properties (land or a building—or part of a building—or both) held to earn rentals or for capital appreciation, or both, rather than for use in the production or supply of goods or services or for administrative purposes.
Power Generation
The process of producing electricity from various energy sources, including fossil fuels, nuclear power, and renewable resources like wind and solar.
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