Answer
b) Since all of the students got the same treatment.
Work Step by Step
It's an experiment so it can't be "A," and no randomization occurred so it can't be "C."
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: 9.21
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