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A study reported that students who play sports get better grades in school than students who do not play sports. Determine which statement below is INCORRECT.

A relationship exists between students playing sports and grades.
The study was observational and not an experiment.
Playing sports will cause students to get better grades in school.
In the study, individuals were observed and variables measured.

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Among the choices provided the incorrect statement is "Playing sports will cause students to get better grades in school."

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