Data+and+Statistics

Frequency tables and histograms for small sets of discrete data Statistical information can be sorted, organised and displayed in a frequency table so that we can analyse and compare the data. The frequency table lists in order the possible scores (or values) and shows the number of times that each score occurs (the frequency of each score). If the values of the scores take only particular number values they are said to be a discrete set. Discrete data often arises when counting is involved. Data of this type can be displayed as a frequency histogram, in which the height of each column shows the frequency of each score. A frequency polygon is a line graph formed by using straight lines to join the midpoints of the tops of the columns. The lines may be continued to join the first and last columns to the horizontal axis. ey ideas