If we assume the opposite of "some people are great writers", namely "most people are bad writers", then there might be a situation where the majority make not good articles that aren't affected by time of day. In such a scenario using the median would be less telling.
That said, most posts here are pretty well-made, so that shouldn't be a problem. If it were the case, then the median would br pretty much even across all times of day, so if you didn't see much difference, then that disproves it.
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If we assume the opposite of "some people are great writers", namely "most people are bad writers", then there might be a situation where the majority make not good articles that aren't affected by time of day. In such a scenario using the median would be less telling.
That said, most posts here are pretty well-made, so that shouldn't be a problem. If it were the case, then the median would br pretty much even across all times of day, so if you didn't see much difference, then that disproves it.