In research study in which participants were fitted with electronically activated recorders so that researchers could sample their daily activities, researchers employed a scientific method known as

Naturalistic observation.

Explanation: In research study in which participants were fitted with electronically activated recorders so that researchers could sample their daily activities, researchers employed a scientific method known as naturalistic observation.

Naturalistic observation is a research method commonly used by psychologists and other social scientists, This technique involves observing subjects in their natural environment. It is a research method that involves studying the subject of interest in its own environment, as it would occur in day-to-day life. Researchers always strive not to influence the environment, as such changes may influence the result of the study.