FIGURE 5.
Schematic representation of 2 × 2 tables, double-trees, and net diagrams (left in probabilities, right in frequencies).
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.