Answer
Too small sample.
Work Step by Step
It is very difficult to see a difference because the sample size is very small (there are only $5$ data values).
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 436: 18.39b
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