I were to select a sample of 30-year-olds, another sample of 40-year-olds, and a third sample of 50-year-olds, test or interview them once, and then test or interview them again 10 years later, this would be an example of what kind of research design?

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This is a sequential research design, which combines elements of both cross-sectional and longitudinal designs by studying different age groups over time.

I Were to Select a Sample of 30-Year-Olds, Another Sample