Education Technology

# Activities

• ##### Subject Area

• Math: PreAlgebra: Linear Functions
• Math: Middle Grades Math: Measurement

6-8

100 Minutes

• ##### Device
• TI-83
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition
• ##### Other Materials
This is Activity 3 from the EXPLORATIONS Book:
Graphing Calculator Activities for Enriching Middle School Mathematics

The following material is required for this activity:
• Meter stick or tape measure

## How Do You Measure Up?

#### Activity Overview

In this activity, students graph scatter plots to investigate possible relationships between two quantitative variables. They collect data and analyze several sets of data pairing the two quantities.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 21 - 32 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Measure the heights (cm) and the arm spans (cm) of class members
• Enter the data as lists
• Find the relationship between height and arm span
• Graph the data as a scatter plot
• Add the graph of line y = x on the scatter plot
• Observe that the data points lie very close to the line y = x
• Compute the ratio of arm span to height
• Predict the arm span of a person of a given height, and guess the height of an individual with a given arm span

• Repeat the activity with other quantitative variables
• #### After the Activity

Students complete the Questions sheet.

Review student results:

• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary