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A travel agency contacted a department store and obtained the list of all people who made purchases using their credit cards at the store in
A travel agency contacted a department store and obtained the list of all people who made purchases using their credit cards at the store in the last month. The agency then surveyed a random sample from the list, calling them to ask their preference for air travel or train travel for taking holidays.
Which of the following types of bias affects the conclusions of the survey?
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