Answer
See below.
Work Step by Step
The best thing would be if the researcher retested the $9$ subjects. Then, the subjects that still perform significantly better than others,are very likely to have 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: 18.11b
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