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 - Apply Your Knowledge - Page 400: 17.11b

Answer

.0047 Statistically significant

Work Step by Step

The z value is: z = $\frac{x-u}{o/\sqrt n}$ = $\frac{47.4-50}{15/\sqrt 225}$ = -2.6 Thus, we find using a z table: .0047 Statistically significant
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