What is an embargo? * 1: a ban on trade and often used as a way to "discipline" another country
2: a tax on imported goods which make those goods more expensive to purchase
3: a limit set on how many of a certain product may be imported.
4: a nifty term that means the same thing as diversifying an economy

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?