Paul believes that taking a stimulant medication (e.g., Rita…

Paul believes that taking a stimulant medication (e.g., Ritalin) will increase college students’ attention spans. To test his hypothesis, he recruits five friends who take ADHD medications and asks them to complete a measure of attention two hours after they have taken their medication. What is wrong with Paul’s research strategy?

Jessica, a 12-year-old girl, recently began developing sever…

Jessica, a 12-year-old girl, recently began developing severe facial acne. She has experienced sadness, social avoidance, and worries about the future. She fears that others perceive her face as ugly and repulsive. Which diagnosis is most consistent with Jessica’s symptoms?