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You should only need to download the jar; the other files are there just to simplify versioning. 

You will also need to download the apache commons math package and put it in your classpath:

In order to use these add-ons you will have to add them to the class path. The easiest way to do this is to edit your RapidMinerGUI script in your <rapid miner director>/scripts. It's called RapidMinerGUI.bat in windows.

Find the section like this:

## set the path to the files with additional operators here or in an environment variable

Change the last line to be:


where the path is where you've saved operators.xml

Next, add the jar to the class path:


You should now see a new category called "Hypothesis Testing" with the TTest operator in it.