Education Technology

# Activities

• ##### Subject Area

• Math: Algebra I: Linear Functions

6-8

60 Minutes

• ##### Device
• TI-73 Explorer™
• ##### Other Materials
This is Activity 1 from the EXPLORATIONS Book:
Activities for Algebra with the TI-73.

The following materials are required for this activity:
• Cassette player
• Tape of crickets chirping

## Cricket Thermometers - for the TI-73 Explorer

#### Activity Overview

In this activity, students investigate the relationship between temperature and number of cricket chirps. They learn to find the other value of a function when given one value of a function. Students use linear regression and plot a set of ordered pairs.

#### 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 1 - 10 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Listen to the chirping, for each temperature record the number of chirps heard in a 15-second time period
• Enter the temperature and the chirps per minute data using lists
• Set the X and Y extremes and create a scatter plot
• Perform a linear regression and study its graph
• Enter the number of chirps per minute for the unknown
• Examine the graph and record the intersection point of the two lines
• The X value of the point of intersection is the temperature of the habitat where the unknown cricket was chirping
• #### 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