Dr. Tucker and his research team are interested in how aggression changes as we age. The team will recruit 100 3-year-old children and assess their levels of aggression every three years until the participants turn 21. This is an example of cross-sectional research.

Question

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This is an example of longitudinal research, where the same group of participants is followed and assessed over a period of time. Cross-sectional research involves comparing different groups of people at a single point in time.

Dr Tucker and His Research Team Are Interested in How