1-24. (factual-21) If I were to select a sample of 30-year-olds, another sample of 40-year-olds,
and a third sample of -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?
a. cross-sectional
*b. sequential
c. longitudinal
d. correlational
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