- Making sure the Performance Max budget is limited to 10% of other campaigns’ budgets.
- Establishing a new CPA or ROAS goal for Performance Max campaigns
- Running the Performance Max experiment for one to two weeks before assessing the results
- Setting up Performance Max with a comparable CPA or ROAS target to other campaigns
The correct answer is: Setting up Performance Max with a comparable CPA or ROAS target to other campaigns
Explanation: When designing an experiment to test Performance Max campaigns, a best practice is to set up Performance Max with a comparable CPA (Cost Per Acquisition) or ROAS (Return On Ad Spend) target to other campaigns. Initially, measure the level of conversions from campaigns across all Google Ads properties and optimize them to the same conversion goals. Post-test, analyze the change in conversions or conversion value at a similar CPA/ROAS between Performance Max and other campaigns. Employ pre-post testing methodology or A/B experiments to compare the success of Performance Max campaigns against others, accounting for potential differences in CPA/ROAS targets.