Correcting Accumulated Statistics; Mean - HP 12c User Manual

The table below shows where the accumulated statistics are stored.
Register
R (and display)
1

Correcting Accumulated Statistics

If you discover you have entered data incorrectly, the accumulated statistics can
easily be corrected:
If the incorrect data point or data pair has just been entered and _ has
been pressed, press gFg^.
If the incorrect data point or data pair is not the most recent one entered, key
in the incorrect data point or data pair again as if it were new, but press
g^ instead of _.
These operations cancel the effect of the incorrect data point or data pair. You can
then enter the data correctly, using _, just as if it were new.

Mean

Pressing gÖ calculates the means (arithmetic averages) of the x-values (
of the y-values (
pressed; to display the mean of the y-values, press ~.
Example: A survey of seven salespersons in your company reveals that they work
the following hours a week and sell the following dollar volumes each month. How
many hours does the average salesperson work each week ? How much does the
average salesperson sell each month ?
File name: hp 12c_user's guide_English_HDPMBF12E44
Printered Date: 2005/7/29
n: number of data pairs accumulated.
Σx: summation of x-values.
R
2
Σx 2
R : summation of squares of x-values.
3
Σy: summation of y-values.
R
4
Σy
2
R summation of squares of y-values.
5
Σxy: summation of products of x-values and y-values.
R
6
y
). The mean of the x-values appears in the display after Ö is
Section 6: Statistics Functions
Statistic
Page: 77 of 209
Dimension: 14.8 cm x 21 cm
77
x
) and