To do this we need to abbreviate the observations to two significant digits. We first write the stems in order down the page. Thus, for the first data point, we write a 6 opposite the 0 stem. These are as given in Table 3 . We then order the leaves, as in Table 4.
Simple inspection can disclose irregularities.
Furthermore, a glance at the figures gives information on their range . For 15 points, the mid point is clearly the eighth largest, so that seven points are less than the median, and seven points are greater than it. To find the median for an even number of points, the procedure is as follows. Data display The simplest way to show data is a dot plot . Figure 1 shows the data from Tables 2 and 5 and together with the median for each set.