Hp 20B Manual do Utilizador descarregar pdf (Página 61)

Statistical Operations

The Data and Stats Menus

Statistics analysis functions are located in the Data and Statistics menus accessible with the :y and:z keys.

See Figure 1 for assistance with navigating through the menus.

Press :y to open the Data menu. In this menu, enter a list of

values for one-variable statistics, a list of pairs, (x, F)

for weighted, one-variable statistics, a list of numbers

for one-variable statistics, or a list of pairs, (x, y) for two-variable

statistics. To enter data, key in a number and press I.

Press :z to analyze the data. If you attempt to open the Statistics (Stats) menu before entering data, you will be

redirected to the Data menu. When opened, the Stats menu displays

2 Vars

for two-variable statistics. Press I

repeatedly to select the type of statistical operations desired, two-variable, (

2 Vars

)

one-variable,

(1 Var

), or one-variable

weighted (

1 Weight

After selecting the type of statistical operation you want, select a sub-menu by pressing < or >, and press I to

open it. Once in a sub-menu, press < or > repeatedly to view the results. To return from the sub-menu to the Statistics

menu, press :z.

Note: in one-variable modes, there are no items for

and the

Predictions

sub-menu is not available.

Pressing I with the

Predictions

sub-menu displayed opens a sub-menu, in which you can choose among six different

types of regression lines. See Figure 1. To select a specific type of regression line in the

Predictions

sub-menu, press

I to cycle through the options. Note: if you press =, the calculator automatically selects the curve that is the best

fit for your data.

Once you select a regression line, press < to see the regression line parameters and perform predictions.

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Hp 20B Manual do Utilizador Página 61