A researcher wants to study how children's problem-solving strategies change between the ages of 5 and 15. She recruits 100 children of different ages and tests each child once on the same set of tasks.
Which of the following best describes the research design the researcher is using?
A cross-sectional design
A longitudinal design
An experimental design
A sequential design
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Developmental psychologists often debate whether psychological changes occur gradually and continuously or in distinct, qualitative stages.
Which of the following best illustrates the continuity vs. discontinuity debate in development?
Whether intelligence is primarily determined by genes or by environment
Whether personality traits remain stable from childhood into adulthood
Whether cognitive development occurs gradually or in distinct qualitative stages
Whether language must be acquired before a critical period ends
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