You fail a test and think, "it's the teacher's fault; he's a horrible professor," yet when you do well on another test in the same course, you think, "i am such a wonderful student! " what is the underlying reason for these thoughts?

self-serving attributional bias

Explanation:The self-serving bias is a tendency of attributing every good thing or positive results to only your effort and attributes any negative outcomes to the external factors .

For example when you fail the exam you attribute this to your teacher as being a horrible professor but if your got higher marks you will attribute that to your own effort.

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