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This note deals with the problem of selecting the better material using a sequential paired comparison test program for the case where individual comparisons are qualitative rather than quantitative (namely, where the test outcome for each paired comparison is stated in terms of a preference for A versus B, or vice versa). A simple K series test method strategy is suggested for the selection procedure, and a table is given for the probability that the better material is indeed selected using this strategy. The application of the probability table to the selection of the better material for the cases of nonsequential qualitative paired comparisons and quantitative paired comparisons is also discussed.
Professor of mechanical engineeringMember of ASTM, School of Engineering, University of Michigan, Dearborn, Mich.
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