HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010

Calculator Tip
l
l
g
ht.
g
hli
g
illustrated below.
If you have trouble seeing the small dots that the calcu ator uses in its
scatter-graphs by defau t then you will be interested in the settings
circled on the ri If you move the hi ht onto the mark for the data
set you are using and press then you will see the menu shown
below from which you can choose a different mark. The contrast is
Two Variable Statistics
As with univariate statistics, summary statistics are
available through the
key in the NUM view.
Pressing this key changes to a screen which lists the following:
MEANX, ΣX, ΣX
2
, MEANY, ΣY,
ΣY
2
, ΣXY, SCOV, PCOV, CORR and RELERR.
See page 131 for information on
RelErr.
y
i
x
i
We will use the set of data shown in the
table on the left to go through the analysis
2
process a second time and this time
3
examine the line of best fit.
2
7
Enter the data into the
NUM view and then
6
switch to the
SYMB view. Make sure that
7
S1 (data set 1) is set to C1 and C2,
3
ed, and that the fit is linear. If not,
6
the fit can be changed in the
SYMB
4
SETUP view.
2
1
1
2
5
6
5
4
5
6
2
128