Originally posted by rjpalmer
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If we know that since Time X two events have definitely occurred and we believe that they occurred entirely by chance alone, then the simple probability (avoiding any statistical upselling around ages of houses or what have you) that they would occur on the same day is simply 1 (the number of times that had happened) over the number of days they could have happened in.
So that's your 1-in-7 or your 1-in-372 or your 1-in-37,000+ or your 1-in-767,000. So, if two events definitely happened and there were only seven days they could have occurred in, then their coinciding on the same day purely by chance alone is self-evidently significantly more likely than if, say, a million years had passed before they both happened and yet still they happened on the same day.
It's simples statistics, mate.
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