Download Note 2A • Basic Statistics Note 2B • Box Plots

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Note 2A
•
Calculator Notes for the Tl-83 Plus and TI-84 Plus
Basic Statistics
You can get several standard statistics for a data set stored in a list. Press
STAT CALC 1:1-Var Stats, enter the name of the list, and press
If the
frequencies of the data values are stored in another list, enter both list names
separated by a comma. The following values will be displayed.
ii
=
the mean.
=
the sum of the x-values.
x2 =
2
the sum of the squares of the x-values.
=
the sample standard deviation.
=
the population standard deviation.
n
=
the number of data values.
minX
=
the minimum data value.
Qi
=
the first quartile.
Med
=
the median.
Q3
=
the third quartile.
maxX
=
the maximum data value.
)
Sx
EDIT [ilJ TESTS
1—Var Stats
2:2—Var Stats
3:Med—Med
4: LinRe9(ax+b)
5:QuadReg
6:CubicReg
1—Var Stats Li
?4QuartRe9
1—Var Stats
x25
x=15O
Ix55øa
5x18. 71828693
x17.O7825128
I-n=6
1—Var Stats
tn=6
riinX=@
Qi=1O
Med=25
raxX=5
You can display some of these statistics individually, such as the mean and
median. Press j [LIST] MATH.
Note 2B
•
Box Plots
The calculator can display up to three box plots at once. First, set up each
plot, and then set up the window.
For help setting the Plot Setup screen, see Note iF. There are two types of
box plots. The first type marks outliers as special. The calculator uses the
standard rule for defining an outlier: Values greater than Q
3 + 1.5 IQR or
than
less
1.5 IQR are outliers. If you select this type of box plot, you
1
Q
must choose what mark to use for an outlier. The second type of box plot
does not show outliers as different from other data points.
—
After setting up all your plots, go to the Window screen to set your graphing
window. See Note iF for help determining the window values to use. In a
box plot Ymin, Ymax, and Ysci can be any value as long as Ymin is less than
‘Ymax. When you are finished setting your window values, press GRAPHI.
jO, 10, 20, 30, 40, 50}. Plot2
Ploti below is a box plot using the data set Li
Data in Plot3 have
20,
50}.
15,
=
{0,
5,
10,
and Plot3 use the data set L2
outhers.
also
shows
This
plot
frequencies L3 = {7, 1, 1, 3, 2, l}.
FiiIiFiu
L L2
Xlist:Li
Freci:1
pe L L2
XlistL
Freci:1
pe L L2 d
Xlist:L
Fre1:L3
Mark:
IJ..,
+