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Identify any likely sources of bias based on the description. Include an explanation of your answer. The National Bank of Springfield sent out questionnaires to

Identify any likely sources of bias based on the description. Include an explanation of your answer.

The National Bank of Springfield sent out questionnaires to a random sample of 500 customers asking whether they would like the bank to extend its hours. Of the 500 questionnaires sent out, 20 were returned and 80% indicated that they would like the bank to extend their hours.

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