frequency polygon. a frequency polygon is a line graph in which points are joined by straight lines...
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![Page 1: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/1.jpg)
Frequency Polygon
![Page 2: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/2.jpg)
Frequency Polygon 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.
![Page 3: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/3.jpg)
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)
![Page 4: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/4.jpg)
Example 1
![Page 5: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/5.jpg)
Example 1
![Page 6: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/6.jpg)
Example 1
![Page 7: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/7.jpg)
Example 2
![Page 8: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/8.jpg)
Example 2
![Page 9: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/9.jpg)
Drawing Frequency Polygon More Examples for you to try:
![Page 10: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/10.jpg)
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
![Page 11: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/11.jpg)
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
![Page 12: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/12.jpg)
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
![Page 13: Frequency Polygon. A frequency polygon is a line graph in which points are joined by straight lines and closed to make a polygon A frequency Polygon](https://reader036.vdocuments.site/reader036/viewer/2022062308/56649dbc5503460f94aae694/html5/thumbnails/13.jpg)
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