Dr. Reyes shows 4-year-olds two identical glasses with equal amounts of juice. She then pours one glass into a tall, narrow container while the children watch. When asked which has more juice, 78% of the children point to the tall container. When the same children are tested at age 7, only 12% make the same error.
Because Dr. Reyes tested the same children at both ages, her design is best described as:
- Acheck_circle
Longitudinal
- B
Cross-sectional
- C
Cross-sequential
- D
Case study
Explanation
Longitudinal research follows the same participants over time. Cross-sectional designs compare different age groups simultaneously. Cross-sequential combines both. A case study examines one individual or unit in depth.