F tests – ANOVA: Fixed effects, omnibus, one-way | ||

Analysis: | A priori: Compute required sample size | |

Input: | Effect size f | 0.25 |

α error probability | 0.05 | |

Power (1-β error probability) | 0.80 | |

Number of groups | 3 | |

Output: | Non-centrality parameter λ | 9.938 |

Critical F | 3.054 | |

Numerator df | 2 | |

Denominator df | 156 | |

Total sample size | 159 | |

Actual power | 0.805 |