Answer
See below.
Work Step by Step
Some of the $9$ people could have done significantly better than others by chance. Thus it is possible that some of the people have no ESP.
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 18 - Inference in Practice - Apply Your Knowledge - Page 424: 18.11a
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