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 414: 17.44b

Answer

Not statistically significant

Work Step by Step

z = $\frac{x-u}{o/\sqrt n}$ = $\frac{126.07 - 128}{15/\sqrt 72}$ = -1.09 P = 2P(Z < -1.09) = 2(.1379) = .2758 This is greater than $ \alpha$, so the difference is not statistically significant.
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