# 13. Find relative frequencies for two-way tables of categorical data (FP)

teaches Common Core State Standards CCSS.Math.Content.8.SP.A.4 http://corestandards.org/Math/Content/8/SP/A/4
teaches Common Core State Standards CCSS.Math.Practice.MP5 http://corestandards.org/Math/Practice/MP5

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Lesson objective: Find relative frequencies for a two-way table.

This lesson helps to build procedural skill with relative frequencies. A two-way table is used here because it supports finding relative frequencies for bivariate categorical data. This work develops students' understanding that examining frequencies in two-way tables and other displays of categorical data gives information about associations.

Students engage in Mathematical Practice 5 (Use appropriate tools strategically) as they analyze a two-way table about the age of students and their bedtimes.

Key vocabulary:

• bivariate categorical data
• conditional frequency
• marginal frequency
• percent
• relative frequency
• two-way table

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