Metrohm 787 KF Titrino - Manual (Page 17)

2.3 Tutorial
787 KF Titrino
13
Viewing the statistics data
If you have not connected a printer, you can view the statistics data on the display with
<SELECT>.
<SELECT>
<SELECT>
<SELECT>
<SELECT>
• From the result display "titer", switch to the display of
the mean value with <SELECT>.
Mean value of 2 determinations.
• Press <SELECT> again and the standard deviation
is shown.
Absolute standard deviation.
• Pressing <SELECT> once more leads to the
relative standard deviation.
• <SELECT> returns you to the result display.
Repeat the titer determination once more.
With a connected printer you may want a printout of the single results that are used for the
statistics calculation: press the key sequence <PRINT><1><ENTER>.
Let us assume that you have discovered that one of the values is an "outlier" and you
would like to delete it.
Deleting a result in the mean value calculation
2 × <CALC DATA>
2× <ENTER>
<SELECT>
<ENTER>
In our example, the deviation of the second result is
excessive. We thus wish to delete it:
• Press <CALC DATA> twice. The display shows:
• Open with <ENTER> the inquiry of the result table
"res.tab:"
• Press <SELECT> to display "delete n". This means
that you wish to delete a single result with the index
n in the result table.
KFR volume 5.676 ml
titer 5.3686 mg/ml
KFR volume 5.676 ml
res.tab: original
KFR volume 5.676 ml
res.tab: delete n
KFR volume 5.676 ml
mean (2) 5.3477 mg/ml
KFR volume 5.676 ml
+/-s 0.02973 mg/ml
KFR volume 5.676 ml
s(rel) 0.56 %
KFR volume 5.676 ml
>statistics