This Instructional Activity is a part of the Lesson 13, Unit 6, Grade 8. In this example, the focus shifts to bivariate categorical data. The prefix bi- means two, so these data contain values for two variables that are both categorical, such as favorite ice cream flavor and gender. The principal also wondered if boys and girls have different favorite ice cream flavors. She decided to redo the survey by taking a random sample of students from the school and recording both their favorite ice cream flavors and their genders.