Suppose a large sample of college students

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Suppose a large sample of college students shows that students who have pierced ears tend to earn less money. Which of the following, if any, is a possible confounding variable: gender (females tend to have pierced ears, and they tend to earn less money), or handedness (left-handed students tend to have pierced ears, and they tend to earn less money), or both of these, or neither of these?

Reference no: EM131816796

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