Oddly Wired
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incompetence

You overestimate your own competence when you are ignorant.

A 1999 study found that low-performers consistently rate their abilities as above average.

When you lack the skills to complete a task, you also lack the skills to recognize your incompetence. This results in an inability to perceive the gap between your performance and the actual objective standard.

You lack the very skill needed to critique yourself.

Where this comes from

Study
Kruger & Dunning (1999), Journal of Personality and Social Psychology
What the check found
The study found that the bottom quartile estimated their performance, on average, at roughly the 60th percentile, which supports the claim of them rating their ability as above average.
Confidence
Well replicated
incompetenceself-assessmentawareness

One of these every day, and every one names the study it came from. When a finding is contested, it says so.