Nonparametric Statistics - Sign Test and Wilcoxon Signed Rank Sum Test

4 important questions on Nonparametric Statistics - Sign Test and Wilcoxon Signed Rank Sum Test

How do you call a test comparing two populations of ordinal data in which the sample data are in matched pairs?

Sign test

How do you call a test in which independent samples are compared from two populations of ordinal or interval but nonnormal data?

Wilcoxon rank sum test

How do you call the following symbol and what does it stand for?

  • T plus
  • Rank sum of positive differences
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
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How do you pronounce the following symbol and what does it stand for?

  • T minus
  • Rank sum of negative differences

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