Smith Glass Co. produces industrial glass. Smith forecasts inspection costs using the high-low method and has compiled the following data from prior results:

Looking solely at the data in the table, which two years should Smith select for the high-low method of analysis? Would you consider using different points and why?

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2015 2017 2018 2019 2016 Total operating hours Inspection costs ($) 5,056 49,734 5,683 50,457 3,197 46,835 4,105 53,227 3,586 43,649