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JoannThe process would be to measure cards from the VG and 7+ ranges drawn relatively randomly. Getting samples of 7+ cards that have presumably not been trimmed would defeat the purpose. The intent would be to take any X number - even just 100 - VG card measurements and any X number of 7+ cards measurements and compare them to see if they ARE different, not to try to make sure they are not different in drawing samples.
I think randomness would be kind of easy. I have maybe 20 T206's in VGish shape, and they are probably pretty random - I've gotten them from various sellers over various years, and didn't buy any with attention to overall size.
Similarly, the randomness of the 7+ group would also be fairly easy except for access to these kinds of cards.
Joann