Answer
See below.
Work Step by Step
It was necessary to screen the patients for eligibility so that other factors can not effect the results of the study and patients with the same medical conditions and health level, etc can be chosen.
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 13 - Section 13.1 - Assess Your Understanding - Applying the Concepts - Page 636: 26a
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