Sampling

True. Many if not most academic studies are of college students between the age of 18 and 25, because they are whatโ€™s readily available. Aellaโ€™s are probably more โ€œrandomโ€ along several dimensions than this, though self-selection bias is a legitimate problem of course. But thatโ€™s also true of the studies I just mentionedโ€ฆ.

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