What is the first step in setting up an ad variation test?

• A. Write new ad copy
• B. Decide if the variation is for all campaigns or specific campaigns only
• C. Create a new account
• D. Choose a bidding strategy

Answer: (B)

Defining where the variation will run is the first move in an ad variation test. Decide whether the variation will be applied across all campaigns or only a subset of campaigns. This choice sets up the experimental design, ensuring you compare apples to apples and control for differences between campaigns. Once scope is defined, you can create the variation within that scope and run the test with consistent metrics and a plan for measuring significance. Writing new ad copy comes after you’ve set the scope, since the variation depends on where you apply it. Creating a new account isn’t needed for testing, and choosing a bidding strategy is a separate setup decision that isn’t the starting point.