How about the range [$0, $99,999,999]? - Now that has got to be 100% accurate, for about any property. Well, at least if we assume the property cannot have a negative value (e.g. contaminated) or be worth more than $99,999,999 (Claude estimates less than 0.01% of homes are worth more than $99,999,999, or less than one in 10,000, e.g. a home owned by some Billionaire like Jeff Bezos).
In my closed sale rankings, if I see a house that is DEFINITELY better than the subject that has a date adjusted sale price of $6,000,000 (and every house with a higher ranking is without doubt better as well) and one that is definitly lower in appeal with a date adjusted sale price of $5,200,000 (and everyone one with a lower ranking definitly less appealing). Then, I have an objective range of
MV range: [$5,200,000, $6,000,000]
Now maybe I could narrow the range. But the statement that the subject MV is within this range, appears well supported and therefore the statement can be taken as 100% accurate.