What I know Can you still remember our previous lesson on Contemponary Music Traditional and New Music composers? Well, here is the continuation of the lesson. Before starting, let us see if you have some knowledge on the next lesson. Read and understand the question then write the letter of your answer on space provided before the number. Answer key

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?