Dr. Tucker wanted to learn how aggression changed across development. He designed a study in which he assessed aggression among 100 3-year-olds and then re-assessed aggression among these individuals every three years until the participants were 21-year-olds. Dr. Tucker's research design was cross-sectional.

Question

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Dr. Tucker's research design was actually longitudinal because he assessed the same individuals over time, rather than comparing different age groups at one point in time, which is what a cross-sectional design would involve.

Dr Tucker Wanted to Learn How Aggression Changed Across Development