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Well just by chance, even if the umps weren't biased at all, one team would probably get more calls than the other. That's just how probability-based things work in small samples. If you had 10 coin flips, it wouldn't be too extraordinary to have 7 heads and 3 tails. So if there were 10 big calls that could have gone either way and 7 go to one team, the other team's fans will probably think it was on purpose, but it's probably just randomness.
Over the course of just a 7-game series, what would be extraordinary is if the distribution of calls was so even that fans of both teams thought the umps were perfectly fair.
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