122
T
T
H
H
E
E
S
S
T
T
A
A
T
T
S
S
A
A
P
P
L
L
E
E
T
T
-
-
U
U
N
N
I
I
V
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R
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D
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A
One of the major strengths of the hp 39g+ is the tools it provides for dealing
with statistical data. The Statistics aplet and its companion the Inference
aplet provide very powerful yet easy to use tools with which to analyze
statistical data.
Unlike most others, the Statistics aplet begins in the
NUM
view, offering easy
input and editing of values, while the
SYMB
view is reserved for specifying
which columns contain data and which ones frequencies, as well as for
indicating pairing of columns for bivariate data. If you have not already done
so, go to the
APLET
view,
and then
the Statistics aplet.
Uni vs. Bi-variate data
The hp 39g+ treats univariate and bivariate
data quite differently and those differences are
reflected in the
SYMB
and
PLOT
views.
Because of this the Statistics chapter has been
split into two and univariate data will be dealt with first. On the screen you
will see a key labeled either
or
. Pressing the key under this
label changes from univariate (
) to bivariate (
) and back. Make
sure the key is showing
before proceeding.
Clearing data
If your
NUM
view had some data in it, you could
press
CLEAR
(above
DEL
) and choose
All
columns
. The
DEL
key is used to delete
individual data points, rather than whole
columns.
Let's use the following set of data and obtain all the usual statistics on it, and
also plot a histogram and a box & whisker graph.
{ 2, 3, 1, 0, -2, 3, 4, 2, 2, 0, 6, 2, 3, 1, 0, 4, 1, 3, 3, 2 }
Move the highlight into column C1 and enter
the data, pressing the
ENTER
key after each
piece of data.
