Answer
The population must be normally distributed.
Work Step by Step
If the data comes from a population that is not normally distributed, a large sample size is required and $n = 18$ is not a large sample size.
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 9 - Section 9.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 448: 22d
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