in a(n) structure, which usually is based on interpersonal relationships, some people have more influence or knowledge that appears on an organizational chart. a. unstructured b. open-ended c. informal d. spontaneous

Martha participates in a research study in order to receive extra credit for her psychology class. when she arrives in the research office she is given a can of what looks and tastes like beer, but which actually contains no alcohol. in the adjoining room martha's classmate karen is also participating in the study. karen receives a can of alcoholic beer. if the experiment was designed to test the effects of alcohol on concentration, then who is exposed to the independent variable?