To test the effectiveness of a new privacy-centric media strategy, recommend using a Holdback treatment group while keeping the control group the same.

• Use Go-dark with the budget of the new media strategy treatment group while the control group remains the same.
• Use 5% Treatment to test gradual budget increments in the new media strategy while the control group remains the same.
• Use heavy-up treatment group to increase the budget of the new media strategy while the control group remains the same.
• Use Holdback treatment group to test the new media strategy while the control group remains the same.

The correct answer is: Use Holdback treatment group to test the new media strategy while the control group remains the same

Explanation: The document discusses the importance of a “Test and learn” approach, specifically under the heading “Step four: Test and learn to determine activation.” This involves experimenting with different levels of personalization and using insights from various digital channels to determine the effectiveness of strategies. Using a holdback group allows for a controlled comparison, measuring the impact of the new strategy against a baseline, ensuring accurate assessment without external influences

Reference article: Implement Cookie-less Geo Experiments