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It doesn't sound like the beard so much as him appearing too young before and the beard making him appear older.

So as long as you don't look like a teenager you shouldn't have problems.

I wouldn't put much stock in that.

If the results were 2/17 vs 7/20 that would not be a statistically significant result; in any case, there could be other major factors such as time-of-day and experience-building which are not discussed.

The job applications limit and 2 week period of this trial suggests that the sample sizes were not any bigger than that.

It's likely just a coincidence.

I have to guess the jump is just coincidental, but who knows... Maybe because all us tech folk are basement dwelling, D&D playing, bearded outcasts, it fit some sort of subconscious stereotype. It'd be interesting to try blue hair or thick geek glasses and whatnot.

Different job applications. I know for a real and accurate a/b test, those job applications should be the same, but it was not like that.