# CONFIDENCE.NORM

## Content

This function returns the confidence interval for a population mean.

## Syntax

`CONFIDENCE.NORM(alpha, stdev, size)`

## Arguments

This function has these arguments:

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

## Remarks

The #VALUE! error value is returned if any argument is nonnumeric. The #NUM! error value is returned if size < 1.

## Examples

`CONFIDENCE.NORM(0.5,B4,D5)`
`CONFIDENCE.NORM(0.5,R4C2,R5C4)`
`CONFIDENCE.NORM(0.05,3.5,150)` gives the result 0.5601063629983405