The self-serving bias might be committed when 3) You attribute your failed test to having a bad instructor and a textbook that's difficult to read.
In the field of social studies, a self-serving bias can be described as a bias in which a person thinks that he is right and attributes his failure to others.
In the scenario mentioned in the question, we are imposing that we failed because we had a bad instructor, as well as the textbook, was not good enough. We are attributing our failure to others such as the instructor and the textbook rather than blaming ourselves. Hence, this is an example of a self-serving bias.
A self-serving bias occurs when we think about ourselves in a positive light always even when we are wrong.
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