Answer
Ordinal.
Work Step by Step
We have to be able to give the data ranks and hence we need to be able to order the attributes, which means that the level of measurement needs to be at least Ordinal.
Elementary Statistics (12th Edition)
by Triola, Mario F.
Published by
Pearson
ISBN 10:
0321836960
ISBN 13:
978-0-32183-696-0
Chapter 13 - Nonparametric Statistics - 13-6 Rank Correlation - Basic Skills and Concepts - Page 672: 2
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