Answer
Option (b) completely randomized design.
Work Step by Step
The subjects were randomly selected and assigned to a treatment
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 9 - Producing Data: Experiments - Check Your Skills - Page 246: 9.23
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