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

Question

Quizplus · Accepted Answer

Cross-sectional designs, which compare different age groups at one point in time, often suggest an early decline in intelligence. Longitudinal designs, which follow the same individuals over time, tend to show that intelligence remains stable until later in life.

When Researchers Use a ____________ Design, They Typically Find That