Categorical data are often summarized in the media, research studies, or general discussions. However, categorical data are summarized differently than numerical data. There is no mean or median that answers the question, “What is your favorite soft drink?” Methods for analyzing categorical data are developed in this lesson.
Categorical data were introduced to students in Grades 6 and 8. This lesson, along with Lessons 10 and 11, revisits and extends work students did in Grade 8 where data on two categorical variables were organized in a two-way table. Students also work with a random sample in this lesson and build on their understanding of a random sample developed in Grade 7.
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