Waiting times (in minutes) of customers at the Jefferson Valley Bank (where all customers enter a single waiting line) and the Bank of Providence (where customers wait in individual lines at three different teller windows) are listed below. Determine whether there is a difference between the two data sets that are not apparent from a comparison of the means and medians. If so, what is it?

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Jefferson Valley 6.5 6.6 6.7 6.8 7.1 7.3 7.4 7.7 7.7 7.7 (single line) Providence (individual 4.2 5.4 5.8 6.2 6.7 7.7 7.7 8.5 9.3 10.0 lines) 00