Answer
The researchers are trying to avoid confounding. Socioeconomic status might be a lurking variable.
Work Step by Step
Maybe adolescents of a higher socioeconomic status eat more and, then, have higher body mass index.
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: 19d
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