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Published byHector Fleming Modified over 9 years ago

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Frequency Polygon

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A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon indicates the spread and skewness of distribution.

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Drawing Frequency Polygon A frequency polygon is drawn by plotting the frequency (or frequency density) against the midpoints of the data. It can be superimposed on a histogram by connecting consecutive midpoints of the tops of columns The area under the polygon represents the frequency of the data ( and is the same as the area of all the bars in the histogram)

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Example 1

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Example 2

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Drawing Frequency Polygon More Examples for you to try:

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Analyzing Frequency Polygon When the sample is large and there is a large number of intervals, since there are a large number of line segments the frequency polygon approaches FREQUENCY CURVE. The Frequency Curve (or the Polygon) indicates the spread/dispersion of the distribution. Low Dispersion High Dispersion

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Analyzing Frequency Polygon A Frequency Curve (or the Polygon) also indicates the SKEWNESS (“lopsidedness”) of the distribution. Normal Curve (symmetric) Examples Weight, Height, IQ Test scores

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Analyzing Frequency Polygon A Frequency Curve (or the Polygon) also indicates the SKEWNESS (“lopsidedness”) of the distribution. Positively Skewed Distribution Examples Number of children in a family Age at which women marry Distribution of wages in a firm Positive side stretched

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Analyzing Frequency Polygon A Frequency Curve (or the Polygon) also indicates the SKEWNESS (“lopsidedness”) of the distribution. Negatively Skewed Distribution Examples Daily maximum temperatures for a month in summer Reaction times for a experiment Negative side stretched

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