Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 1 - Introduction to Statistics - Review - Chapter Quick Quiz - Page 35: 9

Answer

Observational study

Work Step by Step

This is an observational study as the subjects were simply questioned if they smoke or not, and were not exposed to a certain treatment.
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