Elementary Statistics (12th Edition)

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

Chapter 7 - Estimates and Sample Sizes - 7-4 Estimating a Population Standard Deviation or Variance - Basic Skills and Concepts: 20

Answer

48, which is practical.

Work Step by Step

To be 95% confident that s is witin 20% of $\sigma$ by using the table, the corresponding sample size is: 48, which is quite small and hence practical.
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