Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 8 - Hypothesis Testing - 8-2 Basics of Hypothesis Testing - Basic Skills and Concepts - Page 397: 8


a) standard deviation at least 50 b) Null hypothesis: standard deviation=50, alternative hypothesis: standard deviation<50.

Work Step by Step

a) The claim says that the standard deviation is at least 50. b) The null hypothesis says that the standard deviation is equal to 50, whilst the alternative hypothesis says that the claim is false, hence the standard deviation is less than 50.
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