Lillard and peterson (2011) conducted a study in which children were randomly assigned to one of three 9-minute activity conditions: watching spongebob squarepants, watching an educational program, or drawing and coloring. all the children's performance on cognitive tasks was then assessed. because the children were randomly assigned to conditions, this study is an example of research.

quasi-experimental quantitative research ( longitudinal) comes to mind although observation ( could have) played an important role

Explanation:

If each of the chosen subjects would have had been chosen bearing in mind their individual characteristics, or their belonging to a certain predetermined group and the researche would have been based on observation, not just the test results and the conditions ( environmental) and personal would have been eentirely controlled by the researchers then the coordinates then the answer would have been different.

you answered your own : -/