Answer
Obervational study.
Work Step by Step
The subjects did not get any treatment, but they were only asked what makes them happy. Therefore it is an observational study.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Basic Skills and Concepts - Page 32: 8
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