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 - Chapter 20 Exercises - Page 478: 20.29b

Answer

Here we have n = 1400, x̅ = 248, Standard Error = 1.0, df = 1399 and Confidence Level = 99% Using an online calculator, we have t = 2.579 Lower Bound = 248 - (2.579)(1.0) = 245.421 Upper Bound = 248 + (2.579)(1.0) = 250.579

Work Step by Step

Given above
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