"Choose a common stock that has experienced considerable price fluctuations in the past few years. Here are several examples (but there are many others): IBM, J.P. Morgan Chase, AT&T, Amazon.com, Oxford Health Care, and Apple Computer. Find the symbol for the stock (for example, J.P. Morgan Chase is JPM) and the exchange on which it is traded (JPM is traded on the NYSE).
Find the historical ups and down of your chosen stock going back no more than ten years. You can find this information at a number of well known sites on the web. Do a little research to find these site.