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:
Cure Rates
The percentage of people who are considered completely free of a particular disease after undergoing treatment.
Double-Masked Design
Experimental procedure in which neither the participant nor the experimenter knows whether the participant has received the experimental treatment or a placebo.
Manipulated
Being controlled or influenced in a clever and often unfair or selfish way.
Experiment
A research procedure in which a variable is manipulated and the effect of the manipulation is observed.
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