A Researcher Collects Data on a Group of Children Age

Multiple Choice

A researcher collects data on a group of children age 4 and another group age 6. He then waits three years, and collects similar data on these same groups of children, who now are age 7 and 9. His research design is an example of:

A) a sequential-cohort design
B) a cross-sectional design
C) a longitudinal design
D) a correlational design