Question: A psychologist wants to study whether there is a correlation between sleep deprivation and the diagnosis of ADD in students. She randomly selects 20 students

A psychologist wants to study whether there is a correlation between sleep deprivation and the diagnosis of ADD in students. She randomly selects 20 students who are diagnosed with ADD and times how long they are asleep. She found the students slept, on average, six hours a night. What is the sample

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