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A psychologist wants to study a dosage-response relationship between administration of ritalin and changes in students' behaviors. The control group gets no ritalin, and 3 other groups get 1 capsule, 2 capsules, and 3 capsules respectively. Everyday, theachers are asked to rate each student's hyperactivity on a scale from 1-100. What level of measurement is the hyperactivity rating?
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