MATH 321 Lecture 19: Drawing a Frequency Polygon
6 Jul 2019
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Another type of graph that they might ask you to make is a frequency polygon. If we take this skeleton of the points of the heights of the bars and connect those with line segments we get something called a frequency polygon. These are easy to overlay and do a comparison between two datasets. With a frequency polygon, you want to look at marking along your x axis, the midpoints of each classes and denote any difference with scaling marking your axis. Do every other and realize they are the midpoints of each class. For a frequency polygon, you don t make bars but you plot dots and connect the dots with lines. For the dots, graph the order pairs- (the midpoint of thee class, frequency) and then draw a dot. For the first, draw one up to (18,7) This is what the points will look like:
