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Statistics 2Var App

The Statistics 2Var app is designed for the study of bivariate statistics. It provides tools for entering

numerical data, calculating 2-variable summary statistics, and creating 2-variable statistical plots.

The app can exchange data with the Statistics 1Var app and the Spreadsheet app (explained in

the User Guide). It can also receive data from the DataStreamer app and pass summary statistics

directly to the Inference app (where you can calculate confidence intervals and test hypotheses). To

open the Statistics 2Var app, press

and select

Statistics 2Var

. The app opens in Numeric

view.
Numeric view The Numeric view provides a table with up to ten columns for data, named C1

through C9 and C0. The menu items are the same as those in the Statistics 1Var Numeric view (see page 35).
Symbolic view Press

to display the Symbolic view. You can define up to five 2-variable

analyses, named S1–S5, by specifying two data columns and a fit type for each analysis. The

menu items, which change according to the field selected, are:

•

: to specify a data column, or, when a

Fitn

field is selected, to enter or edit a fit

equation. If you enter your own fit equation, the corresponding

Typen

field automatically

changes to

User Defined

•

: displays a menu for you to select a type of fit: linear, logarithmic, exponential, etc.;

visible only when a

Typen

field is selected

•

: toggles between making an analysis active or inactive

•

: enters a C when tapped; visible only when an

field is selected

•

: enters an X when tapped; visible only when a

Fitn

field is selected

•

: specifies whether a graph of the type chosen will be plotted when you display Plot view. If this is not selected, only

the data points are plotted.

•

: displays the selection in textbook format in full-screen view; visible only when an

Fitn

field is selected

•

: evaluates the variables in whatever is selected; visible only when an

Fitn

field is selected