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 394: 17.1b

Answer

Since the sample mean x̄ = 47.4 is 2 standard deviations away from the mean, it is good evidence that the mean is less than 50. Sample mean x̄ = 48.9 is within two standard deviation from the mean, therefore it is not good evidence that the mean is less than 50.

Work Step by Step

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