Biff and his twin brother Bernie, were part of a twins study. They were first observed by the researchers when they were 5 years old, and then again later when they were 10 years old. What type of a study were they in?
A) case
B) cross-sectional
C) longitudinal
D) periodical

Question

Quizplus · Accepted Answer

Biff and Bernie were observed at two different time points, 5 and 10 years old, which indicates they were part of a longitudinal study. Longitudinal studies involve observing the same group of individuals over a period of time to track changes or development.

Biff and His Twin Brother Bernie, Were Part of a Twins