The Basic Practice of Statistics 7th Edition

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

Chapter 18 - Inference in Practice - Chapter 18 Exercises - Page 436: 18.39a

Answer

Not significant

Work Step by Step

Mean = $\frac{6.47 + 7.51 + 10.10+13.63+9.91}{5}$ = 9.524 The z value is the sample mean decreased by mean and divided by the deviation. z = $\frac{x-u}{o/\sqrt n}$ = $\frac{9.524 - 8}{2/\sqrt 5}$ = 1.7 P = 2P(Z < -1.7) = 2(.0446) = .0892
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