It seems fairly easy to get a sequence of random-seeming numbers by e.g. applying some transform to the first ten digits of pi if you remember those, your birth date, other important dates, etc. As long as you come up with a procedure to convert to the scale you need, it shouldn’t be predictable for low sample sizes.
300 random numbers is pushing it, though. For that you’d need a hash function, which most can’t calculate mentally without specific training.
It seems fairly easy to get a sequence of random-seeming numbers by e.g. applying some transform to the first ten digits of pi if you remember those, your birth date, other important dates, etc. As long as you come up with a procedure to convert to the scale you need, it shouldn’t be predictable for low sample sizes.
300 random numbers is pushing it, though. For that you’d need a hash function, which most can’t calculate mentally without specific training.
I seriously doubt the majority of the participants in these casual polls are doing anything like that.