##### Using the CONFIDENCE.T function:

The arguments for the CONFIDENCE.T function are:

Argument | Required? | Description |
---|---|---|

alpha | Required | The significance level used to compute the confidence level. The confidence level equals 100*(1 - alpha)%, or in other words, an alpha of 0.05 indicates a 95 percent confidence level. |

standard_dev | Required | The population standard deviation for the data range and is assumed to be known. |

size | Required | The sample size. |

##### A few more things:

• If any argument is nonnumeric, CONFIDENCE.T returns the #VALUE! error value. |

• If alpha ≤ 0 or alpha ≥ 1, CONFIDENCE.T returns the #NUM! error value. |

• If standard_dev ≤ 0, CONFIDENCE.T returns the #NUM! error value. |

• If size is not an integer, it is truncated. |

• If size = 1, CONFIDENCE.T returns the #DIV/0! error value. |