🧩SPOT THE FLAW: What's Wrong With These Research Designs?
Each scenario below has at least one serious problem. Read each one carefully and comment what you think is wrong 👇

Scenario 1: A student wants to study whether listening to classical music improves memory. They test 10 of their close friends, all from the same school and the same grade. Their conclusion: "Classical music improves memory in teenagers."
📚What's wrong here?

Scenario 2: A researcher surveys students about their daily screen time and their grades. Students who use their phone more than 4 hours a day tend to have lower grades. The conclusion: "Excessive screen time causes lower academic performance."
📚What's wrong here?

Scenario 3: A student studies stress levels among students at their school. They send a survey to 200 students but only 8 respond. They analyze those 8 responses and write up their findings as representative of the school.
📚What's wrong here?

Scenario 4: A researcher tests whether a new study technique improves grades. They teach the technique to students who voluntarily signed up for the program, then compare their grades to students who didn't join. The volunteers' grades go up.
📚What's wrong here?