When researchers use a cross-sectional design, they typically find that both fluid and crystallized intelligence decline relatively early in life, but they often find that both of these abilities remain stable until much later in life when they use a(n) ___________ design.
A)correlational
B)longitudinal
C)self-report
D)experimental

Question

Quizplus · Accepted Answer

Longitudinal designs, which study the same individuals over a period of time, often show that fluid and crystallized intelligence remain stable until later in life, contrasting with cross-sectional designs that compare different age groups at one point in time and may suggest an earlier decline.

When Researchers Use a Cross-Sectional Design, They Typically Find That