The Alameda County study is an example of

A) an experimental longitudinal design.
B) a prospective design.
C) an experimental descriptive design.
D) a correlational cross-sectional design.

Longitudinal Design

A research design that involves repeated observations of the same variables or groups over a period of time, allowing for the study of changes and development.

Prospective Design

A research design that follows participants forward over a period of time to observe future outcomes.

Cross-sectional Design

A research design that analyzes data from a population, or a representative subset, at a specific point in time to examine relationships between variables.