Statistics and demographic information often play a key role in policy analysis. A vast and complex array of statistical information is available online and in the print collections of libraries. Before attempting to use the more specific and complicated statistical sources, it is good to check one of the statistical compilations published regularly by both the government and commercial publishers. Compilations are especially good for finding a single statistic, e.g., the number of elementary school children in the U.S., the ten most populated cities in the United States, the percentage of the U.S. population which is of Hispanic origin, etc.
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