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👀 Methodology Detective: Case #1
Someone submitted this research design to us. Something is off; can you spot the mistake?

The Study
A researcher wants to know whether a new mindfulness app reduces anxiety in teenagers. She recruits 100 students from her own school, gives them the app, and asks them to use it for four weeks. At the end, she surveys the students and finds that 78% of those who used the app every day reported lower anxiety. She concludes that the app effectively reduces anxiety.

Your Task
1. Find the methodological flaw in this study.
2. Explain why it undermines the conclusion.
3. Propose a better design.

Drop your answers here. We will post the solution and the best responses in 48 hours.

Hint: "78% of those who used the app every day..." – read that part again.