## Confidence Interval for the population means when the standard deviation is known.

Confidence level, usually written as 100%, on the interval estimate of a population parameter is the probability that the interval estimate will contain the true population parameter. When

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Confidence Interval | z | |
---|---|---|

80% | 0.200 | 1.282 |

85% | 0.150 | 1.440 |

90% | 0.100 | 1.645 |

95% | 0.050 | 1.960 |

99% | 0.010 | 2.576 |

99.5% | 0.005 | 2.807 |

99.9% | 0.009 | 3.291 |

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