Answer
$n=400$
Work Step by Step
To cut the standard error in half for Exercise 29,
we have $\frac{15}{\sqrt n}=\frac{1.5}{2}$
thus we obtain $n=400$
Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition
by Bluman, Allan
Published by
McGraw-Hill Education
ISBN 10:
0078136334
ISBN 13:
978-0-07813-633-7
Chapter 6 - The Normal Distribution - 6-3 The Central Limit Theorem - Extending the Concepts - Page 354: 30
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