Hp 39g Graphing Calculator Manual do Utilizador descarregar pdf (Página 115)

Calculating predicted values

Find predicted

values

HINT

The functions PREDX and PREDY estimate (predict) values

for X or 7 given a hypothetical value for the other. The

estimation is made based on the curve that has been calculated

to fit the data according to the specified fit.

1. In Plot view, draw the regression curve for the data set.

2. Press 0 to move to the regression curve.

3. Press isSSiS and enter the value of X. The cursor jumps to

the desired point on curve and the coordinate display

shows X and the predicted value of Y.

In HOME,

- Enter PREDX(y-va/M(?) |enter]

to find the predicted (estimated) value for the

independent variable given a hypothetical dependent

value.

- Enter PREDY(x-value) to find the predicted value of

the dependent variable given a hypothetical

independent variable.

You can type PREDX and PREDY into the edit line, or

you can copy these function names from the MATH

menu under the Stat-Two category.

In cases where more than one fit curve is displayed, the

PREDY function uses the most recently calculated curve. In

order to avoid errors with this function, uncheck all fits except

the one that you want to work with, or use the Plot View

method.

Statistics aplet

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Hp 39g Graphing Calculator Manual do Utilizador Página 115