Answer
Must be a normal distribution.
Work Step by Step
The sample size is 9, which is less than 30, so the population should be normal in order for the sample distribution to be normal (central limit theorem).
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 8 - Section 8.1 - Assess Your Understanding - Vocabulary and Skill Building - Page 410: 14c
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