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• “What does the word two in two-way table refer to? How is it seen in the example from the task?” (The number of categorical variables, not the number of categories for each variable. In this example, the two variables are writing utensil preference and paper preference.)
Summarize by stating that “a two-way table can be used to organize data from two di erent categorical variables.”
1.2 Fruit Fly Mutations
10 minutes
The mathematical purpose of this activity is for students to interpret data in a two-way table. Students answer questions using information in a two-way table.
Instructional Routines
• Think pair share
What: Students have quiet time to think about a problem and work on it individually, and then time to share their response or their progress with a partner. Once these partner conversations have taken place, some students are selected to share their thoughts with the class.
Why: This is a teaching routine useful in many contexts whose purpose is to give all students enough time to think about a prompt and form a response before they are expected to try to verbalize their thinking. First they have an opportunity to share their thinking in a low-stakes way with one partner, so that when they share with the class they can feel calm and con dent, as well as say something meaningful that might advance everyone’s understanding. Additionally, the teacher has an opportunity to eavesdrop on the partner conversations so that she can purposefully select students to share with the class.
Launch
Arrange students in groups of 2. After quiet work time, ask students to compare their responses to their partner’s and decide if they are both correct.
Student Task Statement
A scientist is trying to determine the role of speci c genes by looking at traits of fruit ies. The o spring of two fruit ies are examined to determine the color of their eyes and whether they have curled wings or standard wings. Eighty o spring are randomly selected, and the results are recorded in the two-way table.
curled wings
standard wings
red eyes
17
45
white eyes
5
13
8
Teacher Guide Algebra