Answer
See below.
Work Step by Step
Each row has $64$ subjects, thus all of the subjects underwent both treatments.
Thus we cannot use the chi-square test, because each subject should be counted only once in a two-way table.
The Basic Practice of Statistics 7th Edition
by Moore, David S.; Notz, William I.; Fligner, Michael A.
Published by
W. H. Freeman
ISBN 10:
146414253X
ISBN 13:
978-1-46414-253-6
Chapter 25 - Two Categorical Variables: The Chi-Square Test - Chapter 25 Exercises - Page 605: 25.41
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