Answer
It is an observational study.
Work Step by Step
The people were assigned to the treatment group voluntarily, and the researchers simply observe the results of the study.
Introductory Statistics 9th Edition
by Mann, Prem S.
Published by
Wiley
ISBN 10:
1-11905-571-7
ISBN 13:
978-1-11905-571-6
Chapter 1 - Self-Review Test - Page 29: 15
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