Mark is a graduate student who is studying identity formation. he interviews a group of 5-year-olds, a group of 10-year-olds, and a group of 15-year-olds, and asks them what they plan to be when they finish school. in this example, mark is using a research design.

cross-sectional

Explanation:

Cross-sectional research design: This is one of the types of research design or study in which participant's having different ages are being compared at the same point in time. This research study is often used in developmental psychology and is a type of descriptive study.

Example: A study looking at the prevalence of lung cancer in a given population.

Advantage:

1. Cost-effective.

2. Data gathering is easy as compared to a longitudinal study.

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