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02.11.2013 , 05:39 AM | #18
I generated ten random series of a thousand samples each with a simple Python script, and here's the result:

Apologies for the horrible colors. Notice how one of the lines is slightly below the 99.7% confidence interval for a while, before eventually climbing back up? Exactly like you are seeing in your experiment.

While 99.7% may seem like an impressive number, it only covers 997 of every 1000 cases. The remaining three fall outside it. And there are many thousands of players on each server; maybe even tens of thousands. So it's far from impossible for someone to have such a streak of bad luck.