Introduction to Frequency Polygon:
A frequency polygon is a graphical display of a frequency table. The intervals are shown on the X-axis and the number of scores in each interval is represented by the height of a point located above the middle of the interval. The points are connected so that together with the X-axis they form a polygon
Frequency polygons are useful for comparing distributions.This is achieved by overlaying the frequency polygons drawn for different data sets. The figure below provides an example. This will also help us on kinematics equations. The data come from a task in which the goal is to move a computer mouse to a target on the screen as fast as possible. On 20 of the trials, the target was a small rectangle; on the other 20, the target
was a large rectangle. Time to reach the target was recorded on each trial.
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