HP Prime Graphing NW280AAABA manual Predicting values, Home view

Predicting values

In Plot view

In Home view

PredX is a function that predicts a value for X given a value for Y. Likewise, PredY is a function that predicts a value for Y given a value for X. In both cases, the prediction is based on the equation that best fits the data according to the specified fit type.

You can predict values in the Plot view of the Statistics 2Var app and also in Home view.

1.In the Plot view, tap to display the regression curve for the data set (if it is not already displayed).

2.Make sure the trace cursor is on the regression curve. (Press =or \if it is not.)

3.Press >or <. The cursor moves along the regression curve and the corresponding X and Y values are displayed across the bottom of the screen.

(If these values are not visible, tap .)

You can force the cursor to a specific X value by tapping

, entering the value and tapping . The cursor jumps to the specified point on the curve.

If the Statistics 2Var app is the active app, you can also predict X and Y values in the Home view.

•Enter PredX(Y) Eto predict the X value for the specified Y value.

•Enter PredY(X) Eto predict the Y value for the specified X value.

You can type PredX and PredY directly on the entry line, or select them from the App functions menu (under the Statistics 2Var category). The App functions menu is one of the Toolbox menus (D).

Statistics 2Var app 237