What do you mean without any parameters? They had the whole legal argument in which both sides will have tried to convince them of what the right amount is.
It's quite a number of years ago now, but a friend of mine did jury duty on a civil case and they were just told to come up with a figure, so they all just picked a number a random and split the difference between the highest and the lowest. The rationale being that this would be a starting point and there would be further litigation to determine what was "fair".
I think that was Ireland in the 80s or 90s though, I'd "imagine" things are approached with a bit more rigor these days ...
