You are going to experiment by building a Spaghetti Bridge to gather data. Alternatively, you can use the data provided. You will use the data to create a graph and a line of best fit in order to make predictions. Before you get started, don't forget to print out the OnTRACK Algebra Journal for this resource.

**TEKS Standards and Student Expectations**

**A(4)** Linear functions, equations, and inequalities. The student applies the mathematical process standards to formulate statistical relationships and evaluate their reasonableness based on real-world data. The student is expected to:

**A(4)(A)** calculate, using technology, the correlation coefficient between two quantitative variables and interpret this quantity as a measure of the strength of the linear association

**A(4)(B)** compare and contrast association and causation in real-world problems

**A(4)(C)** write, with and without technology, linear functions that provide a reasonable fit to data to estimate solutions and make predictions for real-world problems

**Resource Objective(s)**

Given an experimental situation, write linear functions that provide a reasonable fit to data to estimate the solutions and make predictions.

**Essential Questions**

What is the purpose of creating a line of best fit?

How can graphs be used to make predictions?

**Vocabulary**