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
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
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