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 boxes represent the 25th to 75th percentile, and the end of each line is either the end of the data range or 1.5 of the interquartile range. Dots extending beyond the lines are correlations considered outliers.
