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Which assumption is NOT required for the Wilcoxon signed-rank test?

easy📝 Conceptual Q2 of 15
SciPy - Statistical Tests

Which assumption is NOT required for the Wilcoxon signed-rank test?

AData are paired and come from the same population
BData are normally distributed
CDifferences are symmetrically distributed
DSamples are dependent
Step-by-Step Solution
Solution:

  1. Step 1: Identify Wilcoxon assumptions

    The test requires paired data, dependent samples, and symmetric distribution of differences.

  2. Step 2: Check normality assumption

    Unlike t-tests, Wilcoxon does NOT require normal distribution of data.

  3. Final Answer:

    Data are normally distributed -> Option B

  4. Quick Check:

    Wilcoxon does not require normality [OK]
Quick Trick: Wilcoxon is non-parametric, no normality needed [OK]
Common Mistakes:
MISTAKES
  • Assuming normality is required
  • Confusing with paired t-test assumptions
  • Ignoring symmetry of differences

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