Answer
The survey is biased.
Work Step by Step
The sample is voluntary, therefore who respond to the survey may show an extreme amount of credit card usage and would not be a good representation of the population. Therefore, the survey is biased.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 1 - Introduction to Statistics - Review - Review Exercises - Page 36: 3
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