Answer
Type of pill and type of spray are the factors.
Work Step by Step
A double-blind experiment is needed to produce unbiased results.
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 - Chapter 9 Exercises - Page 249: 9.41
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