The Statistics Aplet - Bivariate Data - HP 39gs Master Manual

T S
T S
H E T A T I S T I C
H E T A T I S T I C
As mentioned in the Univariate section, one of the major strengths of the hp 39gs & hp 40gs is the tools they
provide for dealing with statistical data. Unlike the others, the Statistics aplet begins in the
offers easy input and editing of values, while the
data and which ones frequencies, as well as for indicating pairing of columns for bivariate data.
Uni vs. Bi-variate data
The hp 39gs & hp 40gs treat univariate and bivariate data quite differently and those differences are reflected
in the and
SYMB PLOT
The previous section dealt with univariate data and we are now going to
look at bivariate (paired) data. On the screen in the
Statistics aplet you will see a key labeled as either
Pressing the key under this label changes from univariate (
bivariate ( ) and back. Make sure the key is showing
before proceeding.
Clearing data
x y
i i
1 5
3 10
8 18
5 13
7 16
3 8
6 15
2 8
7 18
9 22
8 17
5 15
7 14
6 18
8 20
5 12
2 8
0 4
7 17
8 19
A - B
A - B
S P L E T I V A
S P L E T I V A
views. Because of this the Statistics chapter has been split into two.
If your view already has some data in it,
NUM
press
SHIFT CLEAR
All columns.
The DEL key is used to delete individual pieces of
data, rather than whole columns. One must be
careful when doing this for bivariate data. If your
data pairs were in column 1 (
( ) then deleting a single piece of data from
C2
without deleting its paired element in
destroy the relationship between the two columns.
In this chapter we will use the set of data left to
show the use of the bivariate features of Statistics.
We will obtain all the usual statistics on it, and
draw a scatter graph.
D
D
R I A T E A T A
R I A T E A T A
view is reserved for specifying which columns contain
SYMB
view of the
NUM
or .
) to
(above ) and choose
DEL
) and column 2
C1
C2
123
view which
NUM
C1
would
20