# CONFIDENCE

## Content

This function returns the confidence interval for a population mean.

## Syntax

`CONFIDENCE( alpha, stdev, size )`

## Arguments

This function has these arguments:

| Argument | Description |
| -------- | ----------- |
| *alpha* | Alpha, significance level used in calculating confidence level, where the confidence level is 100 times (1-*alpha*)% |
| *stdev* | Population standard deviation for the range |
| *size* | Number representing the size of the sample; if not an integer, the number is truncated |

## Data Types

Accepts numeric data for all arguments. Returns numeric data.

## Examples

`CONFIDENCE(0.5,B4,D5)`

`CONFIDENCE(0.5,R4C2,R5C4)`

`CONFIDENCE(0.05,3.5,150)` gives the result 0.560106363