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A researcher is interested in the relationship between attention deficit hyperactivity disorder (ADHD) and conduct disorder in middle school classes. Her hypothesis is that students with ADHD are more likely to experience conduct disorders at school. She obtained a random sample of seventh and eighth graders from a suburban middle school in Washington D.C. ADHD was measured using a self-administered test that ranked the student on the following order: no attention deficit; some attention deficit; high attention deficit, and conduct disorder was a dichotomous (i.e. two category) variable consisting of conduct disorder/no conduct disorder.
a) What is the unit of observation and population for this sample?
Unit of observation
Population
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