A researcher studies one group of children when they are 3, 6, and 9 years old and another group of children when they are 9, 12, and 15 years old. The researcher has used the ______ method.

A researcher studies one group of children when they are 3, 6, and 9 years old and another group of children when they are 9, 12, and 15 years old. The researcher has used the ______ method.



a. panel study
b. cross-sectional
c. sequential
d. longitudinal

Answer: sequential


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