On a separate page joomla add code to head for the split test?

1) Plug in the position for the module:

\r\r

2) you need to Create a page menu item in menu Manager.
3) Create some module in this position the head and put it in your code. Tie this to a module created in step 2 item of the menu.

Good day!

The most simple and modern:

1. Add Google Tag Manager code on all pages of the site;
   
2. Create trigger "Page view", constraint "Page URL equals url_вашей_страницы";
   
3. Add a tag with the code AB-test, and indicate a trigger that was created previously;
   
4. Ready! Code will work only on one page.