HP 17bll+ User Manual page 134

To do curve fitting and forecasting :
1. Enter the data into two SUM lists: one for the x-values and one for the
y-values. Make sure each list has the same number of items so that the
items are in matched pairs.
2. From the SUM menu, press
of SUM-list names. The current list is labeled
otherwise.
3. Press a menu key to select a list of x-values (independent variable).
4. Select a list of y-values (dependent variable).
5. Now you see the FRCST menu. Whichever curve-fitting model was
used last is named in the display. If you want to select a different
 
model, press
6. To calculate the curve-fitting results, press,

.
7. To forecast (estimate) a value:
a.
Key in the known value and press the menu key for that variable.
b.
Press the menu key for the variable whose value you want to
forecast.
Example: Curve Fitting. BJ's Dahlia Garden advertises on a local radio
station. For the past six weeks, the manager has kept records of the
number of minutes of advertising that were purchased, and the sales for
that week.
134 10: Running Total and Statistics
  
, and then the menu key for the model.
to display a menu

unless named
 ,  and