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: 1

Answer

We are 95% confident that the variance is between 916.6 and 2252.1.

Work Step by Step

The round-off rule says that we should round the boundaries of the interval by one more decimal place than the sample values. Then the interval becomes: $\sigma^2 $ is between 916.6 and 2252.1. We are 95% confident that the variance is between 916.6 and 2252.1.
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