Answer:
This study is an example of an interrupted time series analysis.
Step-by-step explanation:
A quasi-experiment is a type of research that does not use random variables and whose purpose is to establish a relationship of cause and effect. Regarded as the strongest quasi-experiment design, an interrupted time series analysis occurs when data is collected at regular intervals during a period of time. In the example given in the question, the researcher collects data, waits six months, then collects data again with the purpose of comparing the scores.