Answer
(a)
Work Step by Step
Tossing a coin gives each community $50\%$ chance of getting selected into participating in the ad. Thus the answer is (a).
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 9 - Producing Data: Experiments - Check Your Skills - Page 247: 9.27
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