Exhibit 10-6
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. 
-Refer to Exhibit 10-6. At 95% confidence, the margin of error is
Definitions:
External Validity
The extent to which the results of a study can be generalized to other situations and to other people.
Interrater Reliability
A measure of how consistently different observers or raters assess, score, or judge a particular trait, behavior, or outcome.
Placebo
A harmless pill, medicine, or procedure prescribed more for the psychological benefit to the patient than for any physiological effect.
Psychological Disorders
Mental disorders characterized by significant disturbances in an individual's thoughts, emotions, or behavior.
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