Answer
See below.
Work Step by Step
Stratified sampling method was used for each treatment group to ensure representation of both adults and children in each group, as the population is divided into two strata, adults and children.
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: 27b
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