The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 17 - Tests of Significance: The Basics - Chapter 17 Exercises - Page 412: 17.31b

Answer

$\approx13.29$

Work Step by Step

$z=\frac{\overline{x}-\mu}{\sigma/\sqrt n}=\frac{2.35-0}{2.5/\sqrt{200}}\approx13.29$
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