title: How to assign 50% of participants to one survey and 50% to another
body: <p>I am using the "Survey Link" template to create a project on Mechanical Turk.</p>
  
  <p>I am running an A/B test. I would like to direct 50% of workers to one link, and 50% to another link.</p>
  
  <p>How do I do this?</p>