Essentials of Statistics (5th Edition)

Published by Pearson
ISBN 10: 0-32192-459-2
ISBN 13: 978-0-32192-459-9

Chapter 1 - Introduction to Statistics - 1-4 Collecting Sample Data - Page 34: 34

Answer

It is a matched pairs design.

Work Step by Step

The twins are randomly given one of the two treatments, therefore they can check at each pair of people what effects each vaccine had. Therefore it is a matched pairs design.
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