Answer:
Correlation research
Step-by-step explanation:
Correlation research can be described as a type of research in which the researcher tends to explain the statistical relationship between tow variable. Often this type of research is non-experimental.
In the scenario mentioned in the question, a statistical relationship is being assessed between the number of hours spent at Starbucks and the GPA. Also, the research was not experimental. Hence, this type of research is correlation research.