Answer
(b) z requires that you know the population standard deviation
Work Step by Step
This is due to the fact that in most cases we do not know the standard deviation of the population.
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 20 - Inference about a Population Mean - Check Your Skills - Page 477: 20.17
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