The Basic Practice of Statistics 7th Edition

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

Chapter 20 - Inference about a Population Mean - Apply Your Knowledge - Page 469: 20.12

Answer

From answer 11, we have n = 16, x̅ = 0.1012, s = 0.2263, df = 15 For a 99% confidence level, using Table C we have: t = 2.947 $σ_{x̅} = \frac{σ}{\sqrt n} = \frac{0.2263}{\sqrt 16} = 0.0566$ Lower Bound = 0.1012 - (2.947)(0.0566) = 0.0655 Upper Bound = 0.1012 + (2.947)(0.0566) = 0.268

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