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.
One hundred samples drawn from a population with mean μ = 8 (solid line) and standard deviation σ = 2.5 (dashed lines) are shown. Seven samples (3, 11, 29, 39, 54, 59, and 96) have a 95% confidence interval that does not include the population mean.
