Introductory Statistics 9th Edition

Published by Wiley
ISBN 10: 1-11905-571-7
ISBN 13: 978-1-11905-571-6

Chapter 1 - Section 1.6 - Design of Experiments - Exercises - Page 22: 1.35


The conclusion is not valid.

Work Step by Step

The participants voluntarily joined the experiment and they are not controlled by the researcher. Thus, the results may be confounded with other variables.
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