The U.S. interstate system takes remarkably straight paths between major cities: specifically, I believe that the true distance between two cities is, on average, only 6/7 of the interstate driving distance. Here's a statistical activity I made for my students:
http://www.mediafire.com/file/h29bsfs2cgoiro0/interstates.doc
If they do a decent sample size, say n = 25, they will almost certainly reject the null hypothesis I state in the problem.
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