Essentials of Statistics (5th Edition)

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

Chapter 8 - Hypothesis Testing - 8-5 Testing a Claim About a Standard Deviation or Variance - Page 423: 3

Answer

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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