Call Extension A/B test?
Re: Call Extension A/B test?
Since ads with extensions are shown above the search results, while, without, can be shown anywhere on the SERP, the comparison between the two versions is not "within the same testing conditions". (In other words, there could be other factors which will affect whether the ad is clicked or not, hence the test could be "statistically biased".
Thus, AdWords campaign experiments do not offer ad extensions A/B testing,
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