The Basic Practice of Statistics 7th Edition

Published by W. H. Freeman
ISBN 10: 146414253X
ISBN 13: 978-1-46414-253-6

Chapter 1 - Picturing Distributions with Graphs - Check Your Skills - Page 37: 1.16

Answer

(b) categorical variable.

Work Step by Step

Although a zip code has a numerical value, it does not make sense to perform numerical operations, such as adding and averaging, using these values. A zip code is a categorical variable because it can be used to place individuals into one of several groups.
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