7-5-6

Graphing Paired-Variable Statistical Data

Drawing a Med-Med Graph

When you suspect that the data contains extreme values, you should use the Med-Med graph (which is based on medians) in place of the linear regression graph. Med-Med graph is similar to the linear regression graph, but it also minimizes the effects of extreme values.

u ClassPad Operation

Start the graphing operation from the Statistics application’s Graph window or List window.

From the Graph window

Tap [Calc] [MedMed Line] [OK] [OK] ".

From the List window

Tap [SetGraph][Setting...], or G.

On the Set StatGraphs dialog box that appears, configure a StatGraph setup with the setting shown below, and then tap [Set].

Type: MedMed

Tap yto draw the graph.

The following is the Med-Med model formula. y = a·x + b

a : Med-Med graph slope

b : Med-Med graph y-intercept

Tip

•When specifying a list of frequency values, make sure that the list contains positive integers only. Non-integer values (such as those with a decimal part) cause an error during statistical calculations.

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