The Basic Practice of Statistics 7th Edition

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

Chapter 27 - One-Way Analysis of Variance: Comparing Several Means - Apply Your Knowledge - Page 664: 27.12a

Answer

See below.

Work Step by Step

The sample size is large enough (at least $30$), thus according to the central limit theorem the sampling distribution of the sampling mean is approximately normal, thus we can use the ANOVA test.
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