One thing that was striking to me was the map showing the male:female ratio among the black population in the US. Without using any actual statistical tools, it

One thing that was striking to me was the map showing the male:female ratio among the black population in the US. Without using any actual statistical tools, it's apparent that areas with a higher black population also have fewer men for every woman. See this map: http://www.censusscope.org/us/map_nhblack.gif http://www.censusscope.org/us/map_nhblack.gif