Why use a frequency polygon rather than a histogram to represent data? For two reasons. Visually, a frequency polygon appears more dynamic than a histogram (a line that represents change in frequency always looks neat). Also, the use of a continuous line suggests that the variable represented by the scores along the x-axis is also a theoretically continuous, interval-level measurement as we talked about in Chapter 2. (To purists, the fact that the bars touch each other in a histogram suggests the interval-level nature of the variable, as well.)
