In developmental research, which type of design involves studying two or more groups of individuals who differ in age or other characteristics at the same point in time?

• A. Longitudinal design
• B. Case study
• C. Cross-sectional design
• D. Single-subject design

Answer: (C)

Verified step by step guidance

1. Understand the key characteristics of each research design option provided: Longitudinal design, Case study, Cross-sectional design, and Single-subject design.
2. Recall that a Longitudinal design involves studying the same individuals repeatedly over an extended period to observe changes over time.
3. Recognize that a Case study focuses on an in-depth analysis of a single individual or a small group, often without comparison across different ages or groups.
4. Identify that a Cross-sectional design involves comparing two or more groups of individuals who differ in age or other characteristics, but all are studied at the same point in time.
5. Confirm that a Single-subject design typically involves intensive study of one individual, often with repeated measures, rather than comparing multiple groups at once.