The Basic Practice of Statistics 7th Edition

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

Chapter 16 - Confidence Intervals: The Basics - Chapter 16 Exercises - Page 388: 16.25b

Answer

29526.19 to 32155.81

Work Step by Step

x = $\frac{33190 + 31860 + 32590 + 31300 + 29730 + 31920}{20}$ = 30841 29526.19 = 30841 - 1314.81 32155.81 = 30841 + 1314.81
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