If there is a positive correlation between number of years studying math and shoe size (for children),

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If there is a positive correlation between number of years studying math and shoe size (for children), does that prove that larger shoes cause more studying of math, or vice versa? Can you think of a confounding variable that might be influencing both of the other variables?

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Essential Statistics

ISBN: 9780134134406

2nd Edition

Authors: Robert Gould, Colleen N. Ryan, Rebecca Wong

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