The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card. You are given the following information. 
A point estimate for the difference between the mean purchases of all users of the two credit cards is
Definitions:
Scientific Experiments
Controlled procedures carried out to investigate relationships between variables and observe the effects of manipulation of one variable on another.
Pain
An unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage.
Psychology
The study of mind and behavior, encompassing all aspects of conscious and unconscious experience as well as thought.
Mutual Friend
A person who has an established friendship with two or more individuals, serving as a social connection between them.
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