Essentials of Statistics (5th Edition)

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

Chapter 7 - Estimates and Sample Sizes - 7-4 Estimating a Population Standard Deviation or Variance - Page 363: 2

Answer

The derivation of the boundaries don't use the sum or difference of 2 expressions but they use the square root of an expression.

Work Step by Step

The reason is that the derivation of the boundaries don't use the sum or difference of 2 expressions but they use the square root of an expression.
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