Answer
Required confidence interval is 15.3 +- 1.018
Work Step by Step
15.3 +- 2.57 x .395 = 15.3 +- 1.018
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 - Chapter 16 Exercises - Page 387: 16.19a
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