Answer
Population distributions might not be normal
Work Step by Step
The central limit theorem cannot be used because both samples are very small, so the two-sample t confidence interval for the difference will not be accurate
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 21 - Comparing Two Means - Apply Your Knowledge - Page 499: 21.11
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