Activity Detail
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Activity Overview

In this activity, students' study the relationship between age and near point accommodation (NPA). They predict a person's age using NPA distance values. They use exponential regression, create box-and-whisker plots and histograms.

Before the Activity

  • Set up the calculator for data collection using the procedure described in the attached Appendix PDF file
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 87 - 96 from the attached PDF file for your class

    		•

    		During the Activity

    		Distribute the pages to the class.

    Follow the Activity procedures:
  • Measure the closest distance between the eye and the paper when the letter on the paper remains in focus (NPA)
  • Record the age, and the distance between the eye and the paper
  • Repeat the procedure with 4 different subjects
  • Enter the age and NPA data for subjects in three different age groups as lists
  • Group the data for different age groups
  • Create a box-and-whisker plot to analyze the data
  • Find the median near point accommodation of the three age groups analyzed
  • Observe that higher the age the greater the width of the box plot
  • Use the graph of the exponential regression to determine the person's age based on his NPA distance

    		After the Activity

    		Students' will complete the Data Collection and Analysis page and answer questions.

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

    		Other Downloads




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    Subject Area:
    Math : Algebra I : Exponential Functions

    Author:
    Texas Instruments

    Level:
    5-8

    Activity Time:
    60 Minutes

    Device:
    TI-73 Explorer™

    Apps:
     

    Software:
     

    Accessories:
     

    Other:
    This is Activity 7 from the EXPLORATIONS Book:
    Activities for Algebra with the TI-73.

    The following materials are required for this activity:

  • Metric ruler (meter stick)
  • String of length: 1.5 meters
  • Eye test sheets with letters


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