Answer
It is a matched pairs design.
Work Step by Step
The twins are randomly given one of the two treatments, so the researchers can check at each pair of people what effects each vaccine had. Therefore it is a matched pairs design.
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 - Beyond the Basics - Page 34: 34
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