Is it possible to know or not?

[JR 137]

Yes and no, DWx. The study I was citing was actually referred to in that article though...

"Research conducted by Burson et al. (2006) set out to test one of the core hypotheses put forth by Kruger and Muller in their paper "Unskilled, unaware, or both? The better-than-average heuristic and statistical regression predict errors in estimates of own performance": "that people at all performance levels are equally poor at estimating their relative performance"."

https://en.m.wikipedia.org/wiki/Dunning–Kruger_effect