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 - Apply Your Knowledge - Page 430: 18.14a

Answer

See below.

Work Step by Step

Power refers to the probability of rejecting the null hypothesis in case of the alternative hypothesis being true. Hence here we have $0.29$ chance of deciding that the average reading scores are above a basic level, in case of the true average reading score being equal to $255$.
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