Bob and Tim are 16-year-old twins who are contacted every three years and asked to complete a series of psychological tests. The type of research study they most likely are part of is called:
A) cross-sectional study
B) longitudinal study
C) age cohort study
D) sequential-cohort study

Question

Quizplus · Accepted Answer

In longitudinal studies, the same participants are studied at various points in time to see how they change as they age. Since this example suggests only one cohort that is studied every three years, the sequential-cohort study is not correct (because there is only one cohort), nor is the cross-sectional study (because participants are studied at more than one point in time).

Bob and Tim Are 16-Year-Old Twins Who Are Contacted Every