# ztest

*z*-test

## Syntax

## Description

returns
a test decision for the null hypothesis that the data in the vector `h`

= ztest(`x`

,`m`

,`sigma`

)`x`

comes
from a normal distribution with mean `m`

and a
standard deviation `sigma`

, using the *z*-test.
The alternative hypothesis is that the mean is not `m`

.
The result `h`

is `1`

if the test
rejects the null hypothesis at the 5% significance level, and `0`

otherwise.

returns
a test decision for the `h`

= ztest(`x`

,`m`

,`sigma`

,`Name,Value`

)*z*-test with additional
options specified by one or more name-value pair arguments. For example,
you can change the significance level or conduct a one-sided test.

## Examples

## Input Arguments

## Output Arguments

## More About

## Tips

Use

`sampsizepwr`

to calculate:The sample size that corresponds to specified power and parameter values;

The power achieved for a particular sample size, given the true parameter value;

The parameter value detectable with the specified sample size and power.

## Extended Capabilities

## Version History

**Introduced before R2006a**

## See Also

`ttest`

| `ttest2`

| `sampsizepwr`