Can Dr. Shelley conclude that taking ADHD medication for brain boosting results in a higher GPA? Select all that apply.
Yes, because the GPA was higher among students who used ADHD medication.
No, because even though their GPA was higher, the students who used ADHD drugs may have been more motivated to study and care more about their GPA than students who did not take the medication.
No, because even though their GPA was higher, the students who used ADHD medication might have already been higher achieving students before they enrolled in the University.