[noobhacker]

I stalked the post's author (your?) LinkedIn and didn't see any background in statistics. How do you know to design this experiment so nicely?

[freemint]

It is a pretty standard statistical test taught in any bachelor level class covering statistics (or earlier in Germany we did this in 11 the grade) . This setup also includes https://en.wikipedia.org/wiki/Blocking_(statistics) another pretty standard method you learn by just looking how others do experiments.