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File name: hp 12c_user's guide_English_HDPMBF12E44 Page: 76 of 209
Printered Date: 2005/7/29 Dimension: 14.8 cm x 21 cm
Section 6
Statistics Functions
Accumulating Statistics
The hp 12c can perform one- or two-variable statistical calculations. The data is
entered into the calculator using the
_
key, which automatically calculates and
stores statistics of the data into storage registers R
1
, through R
6
. (These registers are
therefore referred to as the “statistics registers.”)
Before beginning to accumulate statistics for a new set of data, you should clear
the statistics registers by pressing
f
clear
²
.
*
In one-variable statistical calculations, to enter each data point — referred to as an
“x-value” — key the x-value into the display, then press
_
.
In two-variable statistical calculations, to enter each data pair — referred to as the
“x and y-values”:
1. Key the y-value into the display.
2. Press \.
3. Key the x-value into the display.
4. Press _.
Each time you press
_
, the calculator does the following:
z The number in R
1
is increased by 1, and the result is copied into the display.
z The x-value is added to the number in R
2
.
z The square of the x-value is added to the number in R
3
.
z The y-value is added to the number in R
4
.
z The square of the y-value is added to the number in R
5
.
z The product of the x and y-values is added to the number in R
6
.
*
This also clears the stack registers and the display.