Answer
May be biased.
Work Step by Step
There are certain people who decided not to respond, and they might represent a certain group of the society, therefore they might have biased the poll by not answering.
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 - 1-2 Statistical and Critical Thinking - Basic Skills and Concepts - Page 14: 26
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