© 1999 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
TI
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34
Û
: A Guide for Teachers
17
Heart Rates—1-Variable Statistics
Overview
Students use the statistics functions of the
TI
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34
Û
calculator to investigate the effect of
exercise on heart rate.
Math Concepts
• mean,
minimum,
maximum, and
range
Materials
• TI
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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
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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
<
.
2. Press
v
to enter the
heart rates and
frequencies.
X1=
3. Enter first heart rate and
press
$
.
FRQ=
4. Enter frequency and press
$
.
X2=
