Answer
a) the reaction time
Work Step by Step
The reaction time is what could be used as the explanatory variable since the reaction time could predict the other time.
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 4 - Scatterplots and Correlation - Check Your Skills - Page 119: 4.14
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