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 bottom and the top of each box represent the 25th and 75th percentiles, and the horizontal band within the box represents the median. The upper whisker represents the 75th percentile plus 1.5 times the interquartile range. The lower whisker represents the 25th percentile minus 1.5 times the interquartile range.
