The Basic Practice of Statistics 7th Edition

by Moore, David S.; Notz, William I.; Fligner, Michael A.

Published by W. H. Freeman

ISBN 10: 146414253X

ISBN 13: 978-1-46414-253-6

Chapter 16 - Confidence Intervals: The Basics - Apply Your Knowledge - Page 385: 16.10a

Answer

8.5455 to 15.4545

Work Step by Step

E = 1.645 x $\frac{42}{\sqrt 400}$ = 3.4545 8.5455 = 12 - 3.4545 15.4545 = 12+3.4545

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