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:
ATC
Average Total Cost, which is calculated by dividing the total cost of production by the quantity of output produced. It includes both fixed and variable costs.
MC
Marginal Cost, which refers to the increase or decrease in the total cost of production when the output is adjusted by one additional unit.
AVC
Average Variable Cost, representing the variable costs (costs that change with production volume) per unit of output in economics.
ATC
Average Total Cost, which is the total cost divided by the quantity produced, encompassing both fixed and variable costs.
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