AdSense for Wordpress - AB Testing to improve ad Earnings
How to Split Test Adsense ads in Wordpress using AdSense Ninja plugin - https://www.adsenseninja.com/plugin/
AB / Split testing helps you find which ads make more money, by showing equal number of impressions of each ad variant, and looking at how much each add made in the end.
I was able to find that one ad size made 138% more money than the other ad, over equal number of impressions (about 25000 impressions each).
AdSense Ninja is the only Wordpress plugin and has AB/split testing built into every ad placement. Each ad placement can then run independent sprit test on Desktop or Mobile