Summarizing Bivariate Categorical Data with Relative Frequencies

It is hard to determine whether there is a relationship with the categorical data, because the numbers are so different. Working with a familiar two-way table on super powers, the class determines relative frequencies for each cell and interprets the meaning of the relative frequencies. The discussion of whether relative frequencies are enough to determine whether there is a difference between male and female preferences rounds out the activity. 

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CCSS: Designed
Instructional Ideas

  • Provide a table with only relative frequencies and provide the frequency for one cell; have the class determine the other frequencies based upon the relative frequencies
Classroom Considerations

  • Plan enough time for the class to discuss whether frequencies are enough to determine any patterns presented in a two-way table prior to beginning this lesson
  • Lesson 10 of a 20-lesson module
Pros

  • Builds upon the same data as in previous lesson on two-way tables
  • Exit ticket and problem set utilize 100 as the total to simplify calculations and allow focus to be on the construction of the relative frequencies
Cons

  • None
Common Core