Answer :

The kind of test the researcher is conducting is known as longitudinal study.

Observing the same variables repeatedly over a short or long period of time is the basis of a longitudinal study. While it can also be set up as a longterm randomised experiment, it is frequently a sort of observational study. In social-personality and clinical psychology, longitudinal studies are frequently used to examine the rapid changes in behaviours, thoughts, and emotional responses from to moment or day to day; in developmental psychology, longitudinal studies examine developmental trends over the course of a lifetime; in sociology, longitudinal studies examine life events over lifetimes or centuries; and in consumer research and political polling, longitudinal studies examine consumer trends.

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