The Basic Practice of Statistics 7th Edition

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

Chapter 9 - Producing Data: Experiments - Chapter 9 Exercises - Page 251: 9.51a

Answer

We can better determine the effect of treatment when the placebo group is included, because this allows us to separate the natural variations from the effect of the treatment.

Work Step by Step

We can better determine the effect of treatment when the placebo group is included, because this allows us to separate the natural variations from the effect of the treatment.
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