Answer:
Field experiment
Step-by-step explanation:
In research, a field experiment is an experiment that, unlike experiments that are conducted in a laboratory, takes place in a natural setting. In other words, they are done in the everyday environment of the participants in the experiment (like houses, schools, hospitals). This kind of experiment creates a more natural approach to the topic that want to be researched, however, the researcher cannot control some variables that he can control in a more controlled environment, such as a laboratory.
Therefore, an experiment that is performed in a natural setting, like a mall or someone's home, is called field experiment.