Answer
The explanatory variable is the speed.
Work Step by Step
Fuel consumption is caused by a vehicle's speed. The scatter plot was made in Microsoft Excel.
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 - Apply Your Knowledge - Page 109: 4.8a
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