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.
Statistics: Informed Decisions Using Data (4th Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0321757270
ISBN 13:
978-0-32175-727-2
Chapter 1 - Section 1.2 - Assess Your Understanding - Applying the Concepts - Page 20: 18c
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