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Explain how the psychologist's design allows them to immediately compare age groups while also distinguishing true age-related developmental changes from cohort effects.
Case context: A developmental psychologist wants to study how social media usage patterns change from adolescence to young adulthood. The researcher recruits three cohorts of participants: 12-year-olds, 15-year-olds, and 18-year-olds. Instead of tracking them for a full decade, the researcher decides to monitor all three groups for a targeted period of three years.
Question: Explain how the psychologist's design allows them to immediately compare age groups while also distinguishing true age-related developmental changes from cohort effects.
Sample answer: The researcher can immediately compare different age groups at the first assessment point (similar to a cross-sectional study). By tracking the cohorts for three years, they can observe development over time. If the 12-year-olds' usage at age 15 matches the initial 15-year-olds' usage, it suggests a true age-related change; if not, it suggests a generational cohort effect.
Key points:
- Comparing cohorts initially provides immediate age group comparison.
- Tracking cohorts over three years shows development over time.
- Comparing cohorts at overlapping ages helps distinguish developmental changes from cohort effects.
Rubric: Students should explain that initial comparisons provide immediate age differences and tracking over the three years reveals developmental trajectories, allowing comparisons across cohorts at the same ages to identify cohort effects.
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Research Methods in Psychology - 4th American Edition @ KPU
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