Which statement best describes a graduated point map? it uses xs to demonstrate the number of people living in an area. it uses dots to represent a certain number of people living in an area. it uses shades of color to indicate the number of people living in an area. it uses circles of different sizes to show the population density of an area.

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?