Frequency Distribution Graphs
The same information that is presented in a frequency distribution table can be presented in a graph. The graph shows the scale of measurement (set of categories) along the horizontal axis and the frequencies on the vertical axis. Recall From Chapter 4 that there are four different scales of measurement nominal, ordinal, interval, and ratio. When the measurement scale (scores), consists of numerical values (interval or ratio scale of measurement), there are two options for graphing the frequency distribution.