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:
Basic Emotions
Refers to a set of universally recognized primary emotions such as happiness, sadness, fear, disgust, surprise, and anger.
Psychologists
Professionals specializing in the science of behavior and mind, embracing all aspects of conscious and unconscious experience as well as thought.
Basic Emotions
Fundamental emotions that are hard-wired in humans since birth and universally recognized, including joy, surprise, sadness, anger, fear, and disgust.
Psychologists
Professionals who study mental processes and behavior by observing, interpreting, and recording how people relate to one another and to their environments.
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Q120: Refer to Exhibit 7-2. The point estimate
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