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Oh, I've made a mistake in my earlier calculation, I meant 1% for 2000.
Kinda forgot where exactly should 2 go in that formula (Population Standard Deviation / sqrt(Sample Size))*100%. PSD is considered to be 1/2 for rough error estimations.
And don't forget that humans have extremely uneven distribution of tastes, complicating matters greately. (just try and measure anime popularity near Akihabara!).
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