Answer :
The investigation that was carried out by the researcher illustrates a one-shot case study.
What is a one-shot case study?
It should be noted that a one-shot case study simply means a research design where a single group is observed after experiencing some treatment on a single occasion.
Since the researcher sits in the quad and records the number of minutes each student puts into studying, it's a one-shot case study.
Here, the single group of individuals are selected for observation.
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