Answer
Small sample size.
Work Step by Step
Small sample sizes often imply low power thus the lower power is very likely to be because of the small sample size.
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 - Chapter 18 Exercises - Page 437: 18.45c
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