You have a sample that comes from normal distribution population, then the frequency polygon should look fairly bell-shaped. Indeed, for example, if you have a sample size that is large enough (say n = 50) and Once you have set the chart up, you will get a good perspective of what the distribution looks like, especially if the
Now, if you instead need to graph a cumulative frequency polygon, you will need instead this
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That is exactly what this frequency polygon maker does for you, and most statistical software packages (like Excel) can do for you. Third, you join those points by straight lines, starting from the points on the left, to the right. Second, you put the classes (or individual values) on the X-axis, and their frequencies on the Y-axis,Īnd graph all the corresponding (X, Y) points. Individual values, or in terms of classes. How do you actually construct a frequency polygon?Ī frequency polygon is actually pretty easy to construct:įirst, you need to have the frequency distribution of the data, either in terms of the frequency of Graphically, a frequency polygon would look like this: Of the distribution of the values in a sample. One of those charts that describe the sample is the frequency polygon, which gives you a quick snapshot
The idea of having grouped data is most of the time to summarize a sample, frequently using measures of central tendency, More about this Frequency Polygon Graph Maker
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