12
Discovering Algebra Calculator Notes for the Texas Instruments TI-83 and TI-83/84 Plus
©2007 Key Curriculum Press
Note 1C • Median and Mean (continued)
TI-83 and TI-83/84 Plus
(continued)
Use the down arrow to display the entire list of values.
x
416.875
the mean
x
3335
the sum of the x-values
x
2
1414425
the sum of the squares of the x-values
S
x
58.73290025
the sample standard deviation
x
54.93959751
the population standard deviation
n
8
the number of data values
minX
320
the minimum data value
Q1
375
the first quartile
Med
425
the median
Q3
467.5
the third quartile
maxX
480
the maximum data value
Errors
If you select
1–Var Stats
and forget to enter the list name, the calculator default
will be list
L
1
. If you get
ERR:INVALID DIM
, you have selected a blank list.
Note 1D • Box Plots
Entering the Data
Enter the data set into a list. List
L
1
is used for this example. (See Note 1B if you
need help entering data.)
Setting the
WINDOW
Values
Press
and enter the following values into the
WINDOW
screen.
Xmin
a number slightly less than the minimum of the data.
Xmax
a number slightly greater than the maximum of the data.
Xscl
the distance between tick marks. Although this number is not
critical to graphing a box plot, if it’s too small, the tick marks will
make the x-axis appear too thick.
Ymin
0.
Ymax
10. This number is not important for a box plot. Any number
greater than Ymin will work.
Yscl
0. This number does not affect a box plot.
Xres
1. This number does not affect a box plot.
WINDOW
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