Stats: Data and Models (3rd Edition)

Published by Pearson
ISBN 10: 0321692551
ISBN 13: 978-0-32169-255-9

Chapter 19 - Confidence Intervals for Proportions - Exercises - Page 475: 19


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The grocer is not likely to conclude anything about his customers' opinions because they need to voluntarily respond and mostly those people respond who have the strongest opinions, thus the sample would be biased.
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