In which type of research is no intervention tested?

Descriptive research is characterized by its objective to provide a detailed account of characteristics, behaviors, or phenomena without manipulating variables or testing interventions. This type of research primarily focuses on observing and describing aspects of a population or phenomenon as they naturally occur. It may involve collecting data through surveys, observations, or reviews of existing information, which helps in understanding the current state without introducing any changes that would affect the outcome.

In contrast, experimental and quasi-experimental research designs involve implementing interventions or independent variables to assess their effects on dependent variables. Qualitative research aims to explore and understand perceptions, experiences, and emotions but may also involve some level of intervention in terms of interaction with participants. Therefore, descriptive research stands out as the only approach among the choices that strictly does not involve any intervention.