When a researcher tests several groups of people at the same time each group at a different age, he is conducting a(n) ______ study.
A. Sequential
B. Cross-sectional
C. Longitudinal
D. Observational
Answer:B
When a researcher tests several groups of people at the same time each group at a different age, he is conducting a(n) ______ study.
A. Sequential B. Cross-sectional C. Longitudinal D. Observational