Final answer:
The U.S. Census measures statistics such as reported voting rates and reported registration rates in presidential election years, helping to understand voter participation across various demographic groups.
Step-by-step explanation:
The U.S. Census measures a variety of statistics for the purpose of voting, one key statistic being the "reported voting rates" in presidential election years. This measurement is observed through data collected from surveys such as the Current Population Survey's Voting and Registration Supplements, and it tracks the percentage of the voting-age population (VAP) that reports having voted in an election.
Moreover, the Census also gathers information on "reported registration rates", which indicates the percentage of the VAP that is registered to vote. This data is crucial as it helps understand the level of electoral engagement among different demographic groups over time. It encompasses diverse characteristics such as age, race, and socioeconomic status to provide a detailed picture of voter participation in the United States.