HP 33s - Manual (Page 147)

Statistical Operations 11–3
1. Reenter the incorrect data, but instead of pressing  , press {  . This
deletes the value(s) and decrements n.
2. Enter the correct value(s) using  .
If the incorrect values were the ones just entered, press {  to retrieve
them, then press {  to delete them. (The incorrect y–value was still in the
Y–register, and its x–value was saved in the LAST X register.)
Example:
Key in the x, y–values on the left, then make the corrections shown on the right:
Initial x, y Corrected x, y
20, 4 20, 5
400, 6 40, 6
Keys: Display: Description:
{ c {´}  Clears existing statistical
data.
4 ‘ 20 
)

)
 Enters the first new data
pair.
6 ‘ 400 
)

)
 Display shows n, the
number of data pairs you
entered.
{ 
)


)
 Brings back last x–value.
Last y is still in Y–register.
{ 
)

)
 Deletes the last data pair.
6 ‘ 40 
)

)
 Reenters the last data pair.
4 ‘ 20 { 
)

)
 Deletes the first data pair.
5 ‘ 20 
)

)
 Reenters the first data pair.
There is still a total of two
data pairs in the statistics
registers.