Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 7 - Estimates and Sample Sizes - 7-3 Estimating a Population Mean: 5

Answer

Neither the normal distribution nor the t-distribution apply.

Work Step by Step

The dot plot is not roughly bell-shaped and the sample size is less than 30 (it is 12), hence the sample data is not roughly normally distributed, hence neither the normal distribution nor the t-distribution apply.
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