Elementary Statistics (12th Edition)

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

Chapter 8 - Hypothesis Testing - 8-5 Testing a Claim About a Standard Deviation or Variance - Basic Skills and Concepts - Page 429: 3


90%, same results.

Work Step by Step

The hypothesis test should have: $\alpha=2\cdot 0.05=0.1=1-0.9$, hence the confidence interval level should be 90%. The hypothesis test with 90% confidence interval should give the same results as the critical value method or the P-value method.
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