ABSTRACT
Statistical Guide: A frequency polygon is a figure drawn by connecting dots that show how many subjects had each score. In Figure 1, you can see that eight students had a score of 19, four students had a score of 20, and so on. (Note that the polygon is made to "rest" on the horizontal axis with dashed lines showing that no one scored 14 or lower and no one scored 23 or higher.)
Figure 1 Hypothetical frequency polygon
The distribution in Figure 1 is approximately symmetrical with a high point in the middle. When most of the scores are concentrated at the low end with a tapering off to the right, we say the distribution is skewed to the right (or has a positive skew). When most of the scores are concentrated at the high end with a tapering off to the left, we say the distribution is skewed to the left (or has a negative skew). When drawn as a frequency polygon, a distribution is referred to as a curve.
