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 unbroken line represents the line of best fit while the dashed lines represent the 95th percentile confidence intervals. The dotted lines represent the upper and lower bounds of the prediction interval.
