Hp Prime Graphing Calculator Manuel d'utilisateur télécharger pdf (Page 229)

100

101

Statistics 2Var app 225

Display the

equation

13. Return to the Symbolic view.

Note the expression

in the

Fit1 field. It

shows that the slope

(m) of the regression

line is 425.875 and

the y-intercept (b) is

376.25.

Predict values Let’s now predict the sales figure if advertising were to go

up to

6 minutes.

14. Return to the Plot

view:

The trace option is

active by default.

This option will move

the cursor from data

point to data point as you press

> or <. As you

move from data point to data point, the

corresponding x- and y-values appear at the bottom

of the screen. In this example, the x-axis represents

minutes of advertising and the y-axis represents sales.

However, there is no data point for 6 minutes. Thus

we cannot move the cursor to x = 6. Instead, we need

to predict what y will be when x = 6, based on the

data we do have. To do that, we need to trace the

regression curve, not the data points we have.

15. P r e s s

\ or = to set

the cursor to trace

the regression line

rather than the data

points.

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Hp Prime Graphing Calculator Manuel d'utilisateur Page 229

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