Frequency Polygon

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The page below is a sample from the LabCE course Descriptive Statistics. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Frequency Polygon

The frequency polygon resembles a continuous curve, and is therefore appropriate for illustrating continuous data. Instead of bars, the class midpoints are plotted at heights corresponding to the class frequency. The midpoints are then joined by a line.


    Figure 5
    Frequency of Serum Glucose Levels in 130 Hospital Employees