Sometimes you want to display information about the relationship involving two different phenomena. These data would be called bivariate or paired data. For example, suppose you collected data about the number of days that law‐school candidates studied for a state bar examination and their resulting scores on the exam. The data from eight candidates is shown in Table 1.
One dot would then be plotted for each examinee, giving a total of only eight dots, yet displaying 16 pieces of numerical information. For example, Candidate 1 studied for seven days and received a score of 23. Candidate 1's dot would be plotted at a vertical of 23 and a horizontal of 7 (see Figure 1).
Figure1 .A representative point of data on a scatter plot.