HP 39gs Master Manual page 138

Now position the highlight on column
the screen (shown right) enter
SORT SETUP
column. This will have the effect of pairing columns
then sorting column
C2
retain the existing data pairings. When ready, press
of this sort are shown right.
The final column has not been re-arranged. With a few alterations, it
C3
will contain the rankings. Looking down the column it can be seen that
there are two values of 11.34 (the 4
therefore both be changed to 4. Continuing this process down the
length of column 3 will produce the rankings for the whole 20
competitors. For example, competitor number 7 has a time of 10.51 and
a rank of 1.
Using Stats to find equations from point data
eg. 1 Find the equation of the quadratic which passes through the
points (1,5), (3,15) and (-5,71).
In the Statistics aplet, choose
change to the
SYMB SETUP
model. Clearly this process will only work for those equations which are
available as data models but that does offer quite a few choices (see
page 126).
Change to the view using the
PLOT
press the key. Don't worry that the scale is not good because we
don't care about the graph. It only needs to be drawn in order to
calculate the fit equation.
Finally, change back to the
if necessary.
and press the
C2
C1
into ascending order, re-arranging column
and 5 ). Their ranking should
th th
mode and enter the data. Now
view and choose the Quadratic data
Auto Scale option and
VIEWS
view and see the equation, pressing
SYMB
key. In
as the Dependent
and and
C1 C2
to
C1
. The results
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