A research design that measures personality traits in a single sample of individuals over time is a

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A longitudinal study is a research design that measures a group of individuals over time. In this case, the study is measuring personality traits in a single sample of individuals over time, making it a longitudinal study. A cross-sectional study involves comparing different groups of individuals at the same point in time, a quasi-experimental study involves comparing groups that are not randomly assigned, and a case study focuses on a single individual or group.

A Research Design That Measures Personality Traits in a Single