Elementary Statistics (12th Edition)

Published by Pearson
ISBN 10: 0321836960
ISBN 13: 978-0-32183-696-0

Chapter 13 - Nonparametric Statistics - 13-3 Wilcoxon Signed-Ranks Test for Matched Pairs - Basic Skills and Concepts - Page 653: 1


See below.

Work Step by Step

The requirements are that the sample must be a simple random sample and that the matched pairs' differences are roughly symmetrically distributed. Hence it is called distribution-free because no specific distribution is required.
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