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18 <br />Census Data <br />1818 <br />Census: Conducted every ten <br />years. <br />Purpose is to count every <br />person <br />Used to determine if <br />populations are equal <br />Reported by census blocks <br />ACS: Monthly sample <br />averaged over five years <br />Purpose to estimate a more <br />detailed demographics <br />Used to determine compliance <br />with Voting Rights Act. <br />Reported primarily by census <br />block groups or tracts <br />But California breaks down <br />CVAP data to census block