Texas Instruments TI-34 II Teachers Guide - Page 23

Heart Rates-1-Variable Statistics Overview Students use the statistics functions of the TI-34 Û calculator to investigate the effect of exercise on heart rate. Math Concepts • mean, minimum, maximum, and range Materials • TI-34 Û • stopwatch or a watch with a second hand • student activity (page 19) Introduction Students may be placed in smaller groups for this activity to minimize the amount of data to be entered. Ask the students: • What do you think the average heart rate is for someone your age? • What about after exercising? Activity Have students complete the following investigation to check their estimations. 1. Have the students check their resting heart rate by timing their pulse for 1 minute. (You could time them for 10 seconds and have them multiply by 6, but this could be the most quiet minute of your day!) 2. Collect data on the chart. Enter each student's heart rate and enter a mark in the frequency column. As other students have the same heart rate, add another tally mark in the frequency column. 3. Enter the heart rate data into the TI-34 Ö. a. Enter the first heart rate on the chart as the first X value, and the number of tallies for that heart rate as the frequency. b. You must press $ between entries. For example, enter the first heart rate, and then press $. Enter the first frequency, and then press $. ³ 1. Press % t