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 R1, through R6. (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 fclear².*

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:

zThe number in R1 is increased by 1, and the result is copied into the display.

zThe x-value is added to the number in R2.

zThe square of the x-value is added to the number in R3.

zThe y-value is added to the number in R4.

zThe square of the y-value is added to the number in R5.

zThe product of the x and y-values is added to the number in R6.

* This also clears the stack registers and the display.

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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