Intended for healthcare professionals

Endgames Statistical question

Non-parametric tests

BMJ 2009; 338 doi: (Published 05 March 2009) Cite this as: BMJ 2009;338:b781
  1. John Fletcher, clinical epidemiologist
  1. 1BMJ, London WC1H 9JR
  1. jfletcher{at}

    Which if any of the following statements are false?

    • a) Non-parametric statistics may be used for normally distributed data

    • b) Correlation coefficients are inappropriate for non-normally distributed data

    • c) Medians are always a more valid way than means are to compare non-normally distributed data

    • d) The significance level of a test should be …

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