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 10 - Section 10.2 - Assess Your Understanding - Applying the Concepts - Page 495: 40a

Answer

Since the researchers just took records and studied them, this is an observational study (there was no attempt made to influence variables).

Work Step by Step

Given above.

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