Proportional point symbol Dot Density Map

http://images.google.com/imgres?imgurl=https://courseware.e-education.psu.edu/courses/geog482/graphics/hisp_circles.gif&imgrefurl=https://courseware.e-education.psu.edu/courses/geog482/L03_compiled.html&usg=__IcjvReGPJ29MzBtZ3x9DK_-b0EQ=&h=376&w=499&sz=19&hl=en&start=5&um=1&tbnid=B97QzdVO51PkDM:&tbnh=98&tbnw=130&prev=/images%3Fq%3DProportional%2Bpoint%2Bsymbol%2BDot%2BDensity%2BMap%2Bhispanic%2Bpopulation%26hl%3Den%26client%3Dsafari%26rls%3Den%26um%3D1

Proportional point symbol Dot Density Map's dots varies in size. The size of the dot depends on the measured variable. This map shows the hispanic population in the United States.