Answer:
Longitudinal study
Explanation:
Longitudinal study or research is research that works to show cor-relational research. This research shows the variable over and the extended period of the time. This type of study runs through days, months, years. This study is conducted by research for a long time. This study is time-consuming.
- This study is observable
- Cor-relational research
- Contrast to cross-sectional research
- Data collected at a point of time in cross-sectional research