Consider the variability in traffic congestion in Table 5.5.5 for northeastern and for southwestern cities.
a. Compare population variability of these two groups of cities. In particular, which group shows more variability in congestion from city to city?
b. Compare the relative variability of these two groups of cities. In particular, which is more similar from group to group: the (ordinary) variability or the relative variability?
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TABLE 55.5 Cost Due to Traffic Congestion, per Registered Vehicle Congestion Cost Midwestern Cities Congestion Cost Minneapolis-S. Paul, MN Congestion Cost Nashville, TN Southwestem Cities Congestion Cost NM Corpus Chrisi TX