|Data Source:||U.S. Census Bureau|
Universe: Total population
|P4.||Percent Of The Population In Sample|
|Universe: Total population|
Summary File 3 is a sample (a subset of a population) survey enumerating approximately one in six households. Numbers are then adjusted to "estimate" the population based on the sample. On the other hand, Summary File 1 enumerates 100-percent of the population, so "Percent of the population in sample" table in SF3 shows the quality of the SF3 sample compared to the 100% count.