Professor wong measured the intelligence and temperament of a group of preschoolers. he plans to follow the same group of participants over time and collect similar data when the children are in 3 grade, 6 grade, and 9 grade. this is an example of which type of research design?

Longitudinal design    

Explanation:

Longitudinal study: This is an observational research method, involves collecting data from the same participant during a period.

The research can extend from months to years to decades. Also known as a panel study or longitudinal survey. It involves the continuous or repeated observation of the same participant or the variable.

Types of longitudinal studies: Panel Study and cohort study.  

Disadvantages:

1. They require plenty of time.

2. The gathered data is not 100% reliable.

3. A large sample size required.

4. More expensive than cross-sectional studies.

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