[harshreality]

Yes, if you re-ran the experiment 10 times, it could be completely different. The presented data is based on a single campaign.

Perhaps something was happening that Saturday, something that the post failed to take into account. Perhaps something happened during those weekdays, causing more engagement than normal.

[latitude]

"I went to kindergarten, I know how the alphabet works!" :)

Interestingly enough, nothing was happening on that Saturday. That I actually checked.

I obviously don't disagree that there's a lot of variables in play and some vary faster than others. What I meant by "10x" was that if the list were 20k subscribers instead of 2k for this particular experiment - what would've been the chance of the Saturday open rate jumping up.