The 95% confidence interval for average P is calculated as follows:

Term | Description |
---|---|

v_{1} | 2 * D_{tot } |

v_{2} | 2 * (N_{tot} - D_{tot} + 1) |

v_{3} | 2 * (D_{tot} + 1) |

v_{4} | 2 * (N_{tot} - D_{tot}) |

D_{tot} | Sum of all the defectives |

N_{tot} | Sum of all the sample sizes |

The 95% confidence interval (CI) for %defective is calculated as follows:

Term | Description |
---|---|

Average P | The proportion of items in your process that are defective |

The 95% confidence interval for PPM defective is calculated as follows:

Term | Description |
---|---|

Average P | The proportion of items in your process that are defective |

The 95% confidence interval for process Z is calculated as follows:

Term | Description |
---|---|

Inverse cumulative distribution function (CDF) of a standard normal distribution | |

Average P | The proportion of items in your process that are defective |