# Z Test Statistics Calculator

In statistics, a test used to compare the two means and find if they differ from each other, for a large sample size with known variance value is called as z test. This is an online calculator to find the z-score for a set of data with the standardized random variable, population mean and standard deviation.

In statistics, a test used to compare the two means and find if they differ from each other, for a large sample size with known variance value is called as z test. This is an online calculator to find the z-score for a set of data with the standardized random variable, population mean and standard deviation.

Code to add this calci to your website

#### Formula:

Z Test Statistics Value = (X-µ) / σ
**Where,**
X = Standardized Random Variable
µ = Population Mean
σ = Population Standard Deviation
### Example:

Perform the z test for data set 1,2,3 with standardized random variable as 3.

#### Step 1 :

The population mean is 2 and population SD is 0.8165.

#### Step 2 :

Z score = (3-2) / 0.8165 = 1.2247