Naturalistic observation is a natural observation that is used by psychologists and social psychologists. This is the method in which a researcher observes an object in natural settings. This type of research is conducted when laboratory research is not relevant to the research study.
Sometimes the researcher does not find a suitable subject for their researcher as they can find in natural settings. A researcher wants to observe the behavior of a wild animal that can be possible in natural; settings. In natural settings, the object is not biased and manipulative. It is low in cost.
Thus, Evelyn, a psychology student has used natural observation.
I believe the answer is: The presence or absence of music
independent variable refers to the type of variables that are not influenced by other variables. This represent the things that can be controlled by the researchers in order to ignite a certain causal relationship with the dependent variables ( the things they want to measure)