This Instructional Activity is a part of the Lesson 1, Unit 9, Grade 8. The idea of a function is very limiting when we wish to analyze the relationship between latitude and temperature. Looking at the situation from a statistics point of view is more helpful. In this case, the question becomes: Is there an association between latitude and temperature? This activity asks students to recall the setup necessary to answer this question. As an important step of mathematical modeling, they think about what data they need to collect, how they can collect it, and what methods will help them to analyze the data.