Gladys has a lot on her mind. She has to remember the name of the garage where she gets her car's oil changed, which is an example of memory. She also has to remember that she needs to get the car's oil changed next Tuesday, which is an example of memory.

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?