Within the U.S. it is surprising that the average postal density of the bottom quartile of routes (ranked by cost) is lower than the postal density for the rural routes serving the least densely settled 10 percent of the population (50 versus 89).
The average postal density of the bottom quartile of routes is lower than the postal density for the rural routes
Data are reliable when they are (1) complete (they contain all of the data elements and records needed for the engagement)2 and (2) accurate (they reflect the data entered at the source or, if available, in the source documents).