Given that the data are matched and considering the units of the data, does it make sense to use the difference between each white blood cell count and the corresponding red blood cell count? Why or why not?

Refer to the data in the table below. The entries are white blood cell counts (1000 cells ,?L) and red blood cell counts (million cells ,?L) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

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Subject 2 3 4 5 8.7 5.9 6.2 5.9 White 7.3 4.44 5.59 Red 4.91 4.80 5.17 2.