# Activities

• • • ##### Subject Area

• Math: PreAlgebra: Probability, Statistics and Data Analysis
• Math: Middle Grades Math: Statistics and Probability
• Math: PreAlgebra: Linear Functions

• ##### Author 6-8

60 Minutes

• ##### Device
• TI-30X IIB
• TI-30X IIS
• TI-34 II Explorer Plus™
• ##### Other Materials
This is Activity 11 from the EXPLORATIONS Book:
Math Investigations with the TI-30X IIS and TI-34 II: Activities for the Middle Grades

You will need the following materials for this activity:
• Colored pencils
• Graph paper

The Ordinary Man

#### Activity Overview

Students estimate the heights of people and compare the estimates to the actual heights in a scatter plot.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 107 - 111 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Write down the names of some famous people in the table
• Estimate their heights and record the estimation
• Note down the actual heights
• Using the calculator, convert the estimated and actual heights into inches
• Graph a scatter plot of estimated height versus actual height [both in inches]
• Determine the number of people for which the estimate was correct
• Determine the number of people for which the estimate was too high or too low
• Understand that if all the estimates matched the actual heights, the line would represent y = x
• Recognize the fact that if an estimate was high, the coordinates for that point would lie above the line y = x, and if the estimate was low, the point would lie below the line
• #### After the Activity

Students complete the Student Activity pages.

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