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Probability and Statistics
Activity 11: A Foot is a Foot
–
Or is It?
65
© 1998 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
4. Now enter the data into a list (
L
1
), and then find the
mean.
a. Display the List editor.
3
b. If necessary, clear
L
1
.
$ to highlight
L
1
: b
c. Starting from the first line in
L
1
, enter each length.
(You’ll get an error if
L
1
is still highlighted.)
Remember to press b after each entry.
d. Find the mean of the data in
L
1
.
(1) Return to the Home screen.
- l
(2) Access the - v
MATH
menu and select
mean
.
- v " " [ (pastes
mean(
to the Home
screen)
(3) Calculate the mean.
- v b (selects
L
1
)
E b
5. Ask students to analyze their data:
Was your mean from
L
1
the same as the mean from
the Home screen?
Did everyone find the same average foot size in their
survey? Why or why not?
Would our results be more accurate if we combined
the class data?
How can we combine the data?
Should we combine all the lengths and then find the
mean, or could we combine all the means and find
the mean of that? Would we get the same answer both
ways?