HP Prime Graphing Wireless Calculator Instrukcja Użytkownika Pobierz pdf (Strona 300)

100

101

Press or to set the cursor to trace the regression line rather than the data points.

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

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.

TIP: You could use the same tracing technique to predict—although roughly—how many minutes of

advertising you would need to gain sales of a specied amount. However, a more accurate method is

available: return to Home view and enter Predx(s) where s is the sales gure. Predy and Predx are

app functions.

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, as follows:

●

Go to Numeric view and enter the data directly. See Getting started with the Statistics 2Var app

on page 245 for an example.

●

Go to Home view and copy the data from a list. For example, if you enter L1, tap , and then

enter 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 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, tap , enter C7, and

then press .

NOTE: A data column must have at least four data points to provide valid two-variable statistics.

Whichever method you use, the data you enter is automatically saved. You can leave this app and come back

to it later. You will nd that the data you last entered is still available.

252 Chapter 12 Statistics 2Var app

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