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Pairs of variables with negative relationship

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Which of the following pairs of variables should produce a negative relationship?

A. Model year (2003, 2004, etc.) and price for a used Honda
B. Driving distance from college and weekly cost of gas for a group of commuting college students
C. Number of hours studying and number of errors on a math exam
D. IQ and weight for a group of 3rd-grade students

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