Two Sample Z Test

Two Sample Z Test

Two Sample Z Test

Description

Two sample Z test is a statistical test used to determine whether there is a significant difference between the means of two independent variables.

Why to use

To compare the means of two independent variables

When to use

·         When population variance is known.

·         When sample sizes are more than 30.

When not to use

·         When population variance is unknown.

·         When sample sizes are less than 30.

Prerequisites

·         Two independent samples

·         Each population must be normally distributed

Input

Two independent variables

Output

·         Level of Significance

·         Z Statistic

·         P Value

·         Sample Mean Var 1

·         Sample Mean Var 2

·         Degree of Freedom

·         Alternative Hypothesis

·         Interpretation

Statistical methods used

--

Limitations

·         Less reliable for small sample sizes

Two Sample Z Test is located under
Model Studio > Statistical Analysis > Hypothesis Test > Parametric Test > Two Sample Z Test

Use the drag-and-drop method or double-click to use the algorithm in the canvas. Click the algorithm to view and select different properties for analysis. You can access it using the search option.

      
Properties of Two Sample Z Test

The available properties of Two Sample Z Test are shown below:

The table below describes the different properties of the Two Sample Z Test.

Field

Description

Remark

Run

It allows you to run the node.

--

Explore

It allows you to explore the successfully executed node.

--

Vertical Ellipse

The available options are:

·         Run till node

·         Run from node

--

Task Name

It is the name of the task selected on the workbook canvas.

·         You can click the text field to edit or modify the task's name.

·         Space between words is not allowed in the Task Name.

Independent Variable 1

It allows you to select the first independent variable.

 

Independent Variable 2

It allows you select the second independent variable.

 

Advanced

Alternative

·         It allows you to select the alternative hypothesis test.

·         Available options are

o   Two-sided

o   Larger

o   Smaller

·         By default, the Two-sided test is selected.

 

Add result as a variable

 

 

   
Example of Two Sample Z Test

Let’s consider a dataset with height of two male populations from United States and India. A sample of 50 males from each country is selected.


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