HP Prime Graphing NW280AAABA manual Entering and editing statistical data, Spreadsheet.A1A10 C7 E

The cursor jumps from whatever data point it was on to the regression curve.

16.Tap on the regression line near x = 6 (near the right edge of the display). Then press >until x = 6. If the x-value is not shown at the bottom left of the screen,

tap . When you reach x = 6, you will see that the PREDY value (also displayed at the bottom of the screen) reads 2931.5. Thus the model predicts that sales would rise to $2,931.50 if advertising were increased to 6 minutes.

T i p You could use the same tracing technique to predict—although roughly—how many minutes of advertising you would need to gain sales of a specified amount. However, a more accurate method is available: return to Home view and enter Predx(s) where s is the sales figure. Predy and Predx are app functions. They are discussed in detail in “Statistics 2Var app functions” on page 365.

Entering and editing statistical data

Each column in Numeric view is a dataset and is represented by a variable named C0 to C9. There are three ways to get data into a column:

•Go to Numeric view and enter the data directly. See “Getting started with the Statistics 2Var app” on page 223 for an example.

•Go to Home view and copy the data from a list. For

example, if you enter L1 C1 in Home view, the items in list L1 are copied into column C1 in the Statistics 1Var app.

•Go to Home view and copy the data from a the Spreadsheet app. For example, suppose the data of interest is in A1:A10 in the Spreadsheet app and you want to copy it into column C7. With the Statistics 2Var app open, return to Home view and enter

Spreadsheet.A1:A10 C7 E.

N o t e A data column must have at least four data points to provide valid two-variable statistics.

228 Statistics 2Var app