Hp 20B Manual do Utilizador descarregar pdf (Página 64)

Statistical Operations

Table 10-3 Statistics Example

Keys Display Description

5I1

70I

Inputs values for X(5) and Y(5).

Opens Stats menu.

Opens Descriptive sub-menu.

Displays average

:z<<

Opens Predictions sub-menu. Note: this example

performs calculations based on a linear

(a*X+b)regression line.

<7I

Inputs

as the

Prediction X

value (month 7).

Calculates

Prediction Y

value (sales at month 7).

Displays value for

: the slope of the regression

line.

Displays current value for

: the y-intercept of the

regression line.

Displays value for

Correlation

:z<<

<I<

Opens

Sums

sub-menu. Displays the sum of all y

values (Sigma Y).

To reset the menu items to their default values, with any item of the Data or Statistics menus displayed press :x. At

the prompt,

Stats

, press I. Confirm your choice by pressing I.

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Hp 20B Manual do Utilizador Página 64