A researcher decides to investigate whether there are any changes in people's IQ scores from early adulthood through late adulthood.The researcher (and others)begins with a sample of 21-year-olds and plans to follow this group until they are 80 years old.The type of research design she is planning to employ is called

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The researcher is planning to follow a specific group of people (21-year-olds) over time (until they are 80 years old), making this a longitudinal study design. Cross-sectional studies compare different age groups at the same point in time, time-lag studies compare data from different time periods, and sequential studies combine cross-sectional and longitudinal components.

A Researcher Decides to Investigate Whether There Are Any Changes