https://www.bps.org.uk/research-digest/introverts-use-more-concrete-language-extraverts
The differences make sense in terms of what we know about social behaviour and the introvert-extravert personality dimension.
n = 40, this is junk. they couldn't even get 100 people for this?
these were all sampled from 1 company in amsterdam. the differences could be explained by company culture, or local culture, or whatever. more work needed.
n=40 isn’t actually bad for generalized conclusions, given a reasonable spread in the results. Your second point is a much stronger argument. The sample is entirely non-representative.
IIRC from stats n=32 is generally considered the minimum to be considered representative for a random sample (and this is not a random sample outside of the company in Amsterdam 🙄).
Not every reply is a disagreement. It's a common assumption that we're not always aware of, because it's true often enough.
That's very concrete language you're using there. Are you perchance an introvert? We could make it n = 41 and add a dash more selection bias to boot!
Shitty sample sizes are the majority of "research" nowadays. It's sad how hard it is to find any even in the triple digits.