Texas Instruments TI-30XIIS Teachers Guide - Page 24

Heart Rates - 1-Variable Statistics Overview Students use the statistics functions of the TI-30X ÙS calculator to investigate the effect of exercise on heart rate. Math Concepts Materials • mean, minimum, maximum, and range • TI-30X ÙS • stopwatch or a watch with a second hand • student activity Introduction Students may be placed in smaller groups for this activity to minimize the amount of data to be entered. Ask 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 students check their resting heart rate by timing their pulse for 1 minute. (You could have them time for 10 seconds and then multiply by 6, but this could be the quietest minute of your day!) 2. Collect data on the chart. Enter each student's heart rate and 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-30X ÚS. 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 $. For example, assume a class of 22 students: Rate Students Rate Students 60 3 63 3 61 5 64 1 62 6 65 4 ³ 1. Press % t