The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 18 - Inference in Practice - Apply Your Knowledge - Page 420: 18.7

Answer

(c).

Work Step by Step

In the random selection of telephone numbers there is a chance of variation. But this is the only source of error that was included in the margin of error, thus the other errors are not included. Thus the answer is (c).
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