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Crystallized Intellegence

APPSY-8ZOEWG

Dr. Adams wants to create a study of how individual's crystallized intelligence evolves over time based on the number of hours an individual has listened to a particular music artist. The doctor hypothesizes that people's crystallized intelligence will decrease the more they listen to the particular music artist.

In order to ensure the most accurate results possible, what study method should Dr. Adams use?

A

Cross-sectional study.

B

Naturalistic observation.

C

Latitudinal study.

D

Longitudinal study.

E

Case study.