Education Technology

# Activities

• ##### Subject Area

• Science: Life Science: Human Body
• Math: Algebra I: Linear Functions
• Math: PreAlgebra: Linear Functions

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™

TI Connect™

• ##### Accessories

CBL™/CBL 2™
CBR™/CBR 2™
Sensor - Motion Detector
TI Connectivity Cable

• ##### Other Materials
This is Activity 1 from the EXPLORATIONS Book: Data Collection Activities for the Middle Grades with the TI-73, CBL™, and CBR™

The following materials are required for this activity:
• Meter stick (tape measure)

## A Tall Story

#### Activity Overview

In this activity, students will use the motion detector to measure their current height and obtain a mean value. They will use this and earlier data to plot a graph of height versus age. Students will identify the mathematical model that reflects the pattern of the data and calculate the rate of growth in humans.

#### Before the Activity

• Install the CBL/CBR Application on the students' graphing calculators using TI Connect™, or TI-GRAPH LINK™, TI Connectivity cable and the unit-to-unit link cable
• Connect the TI-73 Explorer™ to the CBR 2™ unit
• See the attached PDF file for detailed instructions for this activity
• Print pages 1 - 9 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Use the CBR to record three readings of the student's current height
• Calculate the mean value
• Gather measurements of student's height at earlier ages
• Set up a scatter plot and get a Manual-Fit on the collected data
• Convert the growth rate from inches per year to centimeters per year, and then to centimeters per month
• Predict a person's height at various ages
• Relate growth rate to the slope of the line
• #### After the Activity

Students will fill in the Student Data Collection and Analysis Sheet.

Review student results:

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