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 large horizontal black lines show the median, the boxes the interquartile range, the whiskers the minimum and maximum, and the dots the outliers.
