I wanted to challenge an ad that we've had running for a couple of months - 20k impressions, 7% CTR.
I chose the "Ad rotation Optimize: Show better performing ads more often".
One week later Google is showing me that the new ad has 300 impressions and a 4% CTR.
Interestingly Google has given less than 2% of the traffic for the keyword to the challenger (98.40% vs 1.60%).
My questions are:
- when will Google decide the experiment is 'over' or will a 2% of the traffic 'always' be sent to the ad? Is 2% an industry standard (I think it was 4% earlier in the week - I didn't keep a record)
- have I done this experiment the right way? Is simply adding another ad the way to go here? I guess I can only assume that the quality of the traffic to the challenger is the same as the quality of the traffic to the control ad.
Thanks in advance for any comments or thoughts