The Basic Practice of Statistics 7th Edition

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

Chapter 16 - Confidence Intervals: The Basics - Check Your Skills - Page 387: 16.15

Answer

(b).

Work Step by Step

Here $n=900,\sigma=125$. Hence: $\sigma_{\overline{x}}=\frac{\sigma}{\sqrt n}=\frac{125}{\sqrt{900}}\approx4.167$, thus the answer is (b).
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