In Myths About the Developing World, Hans Rosling shows some great graphics to display data on health care outcomes. This is one of the talks from the great TED conference that we have mentioned before. They really have some great webcasts available on their site.
The presentation also gives a concrete example of faulty knowledge (people thinking things which are not so – related to theory of knowledge). He also makes good points on stratifying data at the 14 minute mark. See gapminder.org for good additional material.