z tests for two proportions for Tops/Bottoms Boxes

Besides the mean comparisons between products or time-points, in consumer studies for example, usually Tops (1, 2, 3..) and Bottoms proportions/percentages are also required. As the number of questions is usually large, the inclusion of the results of  z tests for two proportions  would be extremely useful.  The letter representation of the paired differences is also necessary.  Find attached an example from SPSS software.

  • José Marcos Vendramini
  • Oct 23 2019
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