Casio fx-7400G PLUS Gebruik - Pagina 2

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A Resource for Free-standing Mathematics Qualifications

TO FIND OUT HOW WELL A MODEL FITS DATA

Use MENU 4 (GRAPH) and the notes overleaf, using

the options you need.

• Use the PARM option to enter the points first.

• Then use the Y= option to enter the function.

• Press DRAW (F4) to plot the points and then the function.

TO FIND A FUNCTION TO MODEL DATA

Use MENU 2 (STAT)

• Enter the data values, pressing EXE after each value. There are 6 lists.

Press

on the REPLAY button if you want to use lists 3, 4, 5 or 6.

• To delete previous values, press

and DEL (F1) to delete just the highlighted value.

• To choose which lists the graph will use, press GRPH (F1) then

then SET (F4). The display will show the set-up for Graph 1.

Use

on the REPLAY button to scroll down.

Check that the G-Type is Scat (if it isn't, press F1).

Use the F buttons to choose lists for the X and Y values on the graph.

The Freq should be set to 1.

M-type gives you a choice of different markers for the points.

If you want to select lists for another graph, highlight StatGraph1 at the top of the

list, then use the F buttons to select another graph.

Finally press EXE or QUIT to return to the lists.

• To draw a graph of the points press GPH1 (F1) or one of the other F buttons.

• To find a model

Press X (F1) for a linear function or X^2 (F3) for a quadratic function.

Press

then one of the F buttons for other options.

eg Exp (F2) gives the best exponential function to model the data.

Note that the given r value is a measure of how closely the function fits the data.

A value of 1 or – 1 means the function is an exact fit.

Press DRAW (f4) to draw the graph of the function over the points.

Press QUIT to go back to the lists.

Using the Casio fx-7400G PLUS

when necessary to find

then DEL A (F2) to delete a whole list

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