Statistics: Informed Decisions Using Data (4th Edition)

Published by Pearson
ISBN 10: 0321757270
ISBN 13: 978-0-32175-727-2

Chapter 1 - Section 1.2 - Assess Your Understanding - Applying the Concepts: 18c

Answer

To avoid confounding.

Work Step by Step

In this case, the researchers want to eliminate the influence of other explanatory variables: demographic and lifestyle. Read confounding definition, page 17.
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