HP 10s User Manual page 30

Estimated value of X2=175.5872105 when yi= 20
20 [suet] [svar] [>] [>] (>) (2 | Ew
Data Entry Hints
@ Press to enter the same data twice.
@ Press [3] to enter the same data several times.
For example, pressing 30 [+] 40 (sm) (5) 5 (DT)
enters the data pair {30, 40} 5 times.
@ The same data entry hints noted for Standard Deviation
mode (see earlier) also apply in Regression mode.
@ When carrying out statistical calculations, do not
store any data in variables A to F, X or Y. These
variables are used as temporary memory during
calculations and thus their contents could get
overwritten during a calculation.
@ Variables A to F, X and Y are cleared when you
select REG mode and choose a regression type
(Lin, Log, Exp, Pwr, Inv, Quad). They are also
cleared if you switch to another regression type.
Technical Data
m = Troubleshooting------
If the result of a calculation is not what you expected,
or if an error occurs please carry out the following
steps.
1.Press the [2] (Mode) El keys in that
order to reset all modes and settings.
2.Check that the formula or expression you
entered is correct.
3. Select the correct mode and try the calculation again.
If the problem persists, press (ON). The calculator will
perform a self-check and, if an abnormality is found,
clear all stored data. For this reason, you should
always have a copy of all important information kept
separate from the calculator.
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