Answer
n = 400; .735
n = 1600; .3675
Work Step by Step
E = 1.96 x $\frac{7.5}{\sqrt 400}$ = .735
E = 1.96 x $\frac{7.5}{\sqrt 1600}$ = .3675
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: 16.9b
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