Key Concepts

• Contingency tables are often used to display and summarize data.
• Probability rules for complementary events, conditional probabilities, independent events, and mutually exclusive events can be applied to data displayed in contingency tables.

Glossary

contingency table: the method of displaying a frequency distribution as a table with rows and columns to show how two variables may be dependent (contingent) upon each other. The table provides an easy way to calculate conditional probabilities.