Both equal intervals and a true 0 point is established. Ratio scaling is not common in educational research. Sometimes called summary statistics . Used to summarize, organize, and reduce large sets of numbers. These include frequencies, percentages, averages, etc.
Frequency distributions is one way that data is presented.
It takes data and groups by how often each score was obtained. Histograms are the most commonly used method. They are a two dimensional representation of the frequency of occurrence for each score. Vertical axis depicts frequencies. Frequency Polygons are also commonly used to display data.