Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The box represents the upper and lower quartiles, the short black line within the box represents the median, the whiskers represent the 5th and 95th percentiles, and the circles extreme values.
