This type of graph is a proportional circle map. The map shows circles of different sizes against a geography, in this case of the United States. The size of each circle is proportional to the data being measured, in this case aggravated assault arrests. The smaller circles over states like Montana show that a small proportion of total aggravated assault arrests occurred in Montana, while the large circle over California says that a large proportion of the total aggravated assault arrests occurred in the state of California.
http://personal.frostburg.edu/jaelder0/symbolizarion%20map%202.jpg
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