Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

Published by McGraw-Hill Education
ISBN 10: 0078136334
ISBN 13: 978-0-07813-633-7

Chapter 7 - Confidence Intervals and Sample - 7-4 Confidence Intervals for Variances and Standard Deviations - Exercises 7-4 - Page 404: 11

Answer

n = 25, s = 462 , df = 25-1=24, α = 1-0.95 = 0.05 To find χ2 right , α/2=0.025 From the table, χ2 right =39.364 To find χ2 left, 1-0.025=0.975 From the table, χ2 left =12.401 The Confidence Interval for a Variance: $ \frac{(n-1)s^2}{χ2 right}$
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