Figure 2.
Three distinct distributions. (a) distribution of a population or a sample; (b) a sampling distribution of sample means; (c) the standardized normal; (Z) distribution.
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.