Question: What's a control group?
- It's a group included with the experiment but are still partialy separated from the experiment.
- It's a group included with the experiment.
- It's a group separated from the rest of the experiment.
- It's a group separated from the rest of the experiment but are still included in the test.
Explanation
In Google Ads testing, a control group provides the baseline for comparison. It is not exposed to the tested change, so its results show what would likely happen without that change. Comparing it with the test group helps isolate incremental impact. This structure supports reliable measurement in Campaign Experiments and lift-based testing.
Why the other options are incorrect
Included group does not describe a baseline used for comparison.
Experiment-included group incorrectly places the baseline inside the changed treatment.
Partially separated group is unclear because a valid control must remain distinct from the tested change.
Source for verification
https://support.google.com/google-ads/answer/6261395
https://support.google.com/google-ads/answer/12003020
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