## Confidence Interval for Mean (Z)

Use this calculator to compute the confidence interval for population mean when the population standard deviation is known.

Confidence Interval Calculator for mean | |
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Sample Size ($n$) | |

Sample Mean ($\overline{x}$) | |

Population Standard Deviation ($\sigma$) | |

Confidence Level ($1-\alpha$) | |

Results | |

Standard Error of Mean: | |

Z Critical Value : ($Z$) | |

Margin of Error: ($E$) | |

Lower Confidence Limits: | |

Upper Confidence Limits: | |