Correcting
Errors
in
Data
Entry
If you make a mistake in entering statistical data, delete the incorrect
data
and
add the correct data. Even if only one value of an x, y-pair is
incorrect, you must delete and then reenter both values.
To
correct
statistical
data:
1.
Reenter the incorrect data,
but
instead of pressing
12+1,
press
Biz-1.
This deletes
the
value(s)
and
decrements n.
2. Enter
the
correct value(s) using I2+1.
If the incorrect values were the ones just entered, you can simply
press
111
lastx | to retrieve them, then BUEI to delete them. (The in
correct y-value was still in the Y-register, and its x-value was saved in
the
LASTx register.)
Example.
Key in the x, y-values on the left, then make the correc
tions shown on the right.
Keys:
Initial
x,
y
Corrected
x,
y
20.
4
400.
6
20.
5
40.
6
Display:
111CLEAR| m
4 1ENTER1
20
fS+1
6 1
ENTER
1
400
IH+l
1.8888
2.8888
HI
LASTx
|
488.8888
Description:
Clears previous statisti
cal
data,
then
enters
two data pairs. Display
shows
n,
the
number
of data pairs entered.
Brings back last x-
value. Last y is still in
Y-register. (Press |x$y|
twice to check y.)
Deletes
and
replaces
last data pair (400, 6 to
40, 6).
2-
6 I
ENTER
|
40
n+]
1.0888
2,8888
11:
Statistical
Operations
155
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