I've got 1,000,000 widgets split into 60,000 groups that are similar sized but not equal. Each group is broadly similar but has four or five characteristics that differ in a reasonably narrow range. How many do I need to sample to get a representative view of the whole? Is that number different if the number of groups is higher (say 250k)?
I don't necessarily need definitive answers, I'm just hoping to be pointed in the right direction to do some background reading on the subject.
I don't necessarily need definitive answers, I'm just hoping to be pointed in the right direction to do some background reading on the subject.
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