On its website, the Statesman Journal newspaper (Salem, Oregon, 2005) reports mortgage loan interest rates for 30 year and 15-year fixed-rate mortgage loans for a number of Willamette Valley lending institutions. Of interest is whether there is any systematic difference between 30 year rates and 15-year rates (expressed as annual percentage rate or APR). The table below displays the 30 year rate and the 15-year rate for each of nine lending institutions. The figure below the data gives side-by-side Minitab box-and-whiskers plots of the 30-year rates and the 15-year rates. Interpret the plots by comparing the central tendencies and variabilities of the 15-and 30-year rates.

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Lending Institution Blue Ribbon Home Mortgage 30-Year 15-Year 5.375 4.750 Coast To Coast Mortgage Lending 5.250 4.750 Community Mortgage Services Inc. 5.000 4.500 Liberty Mortgage 5.375 4.875 4.875 Jim Morrison's MBI 5.250 Professional Valley Mortgage 5.000 5.250 Mortgage First 5.750 5.250 Professional Mortgage Corporation Resident Lending Group Inc. 5.500 5.125 5.625 5.250 Term of Mortgage 5.75 5.50 - 5.25 - 5.00 - 4.75 - 4.50 30-Year 15-Year Mortgage Rate