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 thick lines in the boxes represent the median; the bottom and top of the box, the first and third quartiles, respectively; whiskers, an additional 1.5 times the IQR lower than the first quartile and higher than the third quartile; and dots, more extreme values that lie outside 1.5 times the IQR.
