HP Prime Graphing NW280AAABA manual Display the equation Predict values

Display the equation

Predict values

13.Return to the Symbolic view.

Y

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.

Let’s now predict the sales figure if advertising were to go up to 6 minutes.

14.Return to the Plot view:

P

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

Statistics 2Var app 227