Below is a table of the number of samples against the critical value of the statistic $W$ for the Wilcoxon Signed Rank Test. The alpha level is 5%, for a two-tailed test. Sample values up to 25 are shown - for more than 25 samples, calculating the z-score and the resulting p-value will yield accurate enough results.

Number or Samples | W(critical) |
---|---|

6 | 0 |

7 | 2 |

8 | 4 |

9 | 6 |

10 | 8 |

11 | 11 |

12 | 14 |

13 | 17 |

14 | 21 |

15 | 25 |

16 | 30 |

17 | 35 |

18 | 40 |

19 | 46 |

20 | 52 |

21 | 58 |

22 | 65 |

23 | 73 |

24 | 81 |

25 | 89 |

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