Table 18.3 shows the count and mR value for each month of the year 2001. We
then average the moving ranges. Add up all of the moving ranges and divide by the
number of months differentiated (11), and we come up with 4.27 for our average
moving range. The center line, see Figure 18.8, shows the average moving range.
The upper limit is 13.96.
Table 18.4 shows the count and mR value for each month of the year 2000. We
then average the moving ranges. Add up all of the moving ranges and divide by the
number of months differentiated (11), and we come up with 2.64 for our average
moving range. The center line, see Figure 18.9, shows the average moving range.
The upper limit is 8.61.
While these charts are clear and easy to understand, they don??™t tell us enough
of the story. To make these charts more relevant, we need to include a corresponding
chart for the individual values represented by the individual months for each
year in order to show a correlation or relationship between the values displayed.
UCL = 13.959
LCL = 0.
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