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: 20

Answer

22.463.

Work Step by Step

k=35, z=-1.645, hence using the given formula: $X^2=k(1-\frac{2}{9k}+z\sqrt{\frac{2}{9k}})^3=35(1-\frac{2}{9\cdot35}-1.645\sqrt{\frac{2}{9\cdot35}})^3=22.463.$ Hence we can see that this value is really close to the value we got by using STATDISK and Minitab, even closer than the value we got in the previous exercise.
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