Based on the information given, the overconfidence effect is a bias which indicates that the confidence of the teacher is greater than the accuracy of the judgements.
What is a bias?
A bias simply means a prejudice against a particular person or group. A mental set simply means the ability of the brain to stick to a particular thing and ignore other alternatives. In this case, the teacher sticked with only what he was told.
The confirmation bias simply means a prejudice against someone. This is unfair towards the person.
Learn more about bias on:
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