Adding the numbers, since they settle part of this. If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way. Most of the apparent contradictions in these threads dissolve at that step.
A narrower follow-up, since the general answer is now clear:
How would you tell the difference between that and the alternative explanation?
stefan_berlin said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
This is where I part company with the consensus forming above. Pushing back on the anecdote-stacking. Twenty people reporting the same thing is twenty samples from the same self-selected pool, not twenty independent confirmations.
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Shop Reference Standardsstefan_berlin said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
That is right, and it stops being right at the edges. The general case is well behaved; the interesting cases in this thread are all at the boundary where the general case breaks.
stefan_berlin said:If you are comparing against somebody else’s result, check that you are comparing the same measurement taken the same way.
Saving this. It is the first explanation that did not require me to already understand it.