The huge error which Estaban is making based on the fact that he thinks that Delores spends longer time on the phone and this is making a fundamental attribution error,
This refers to the miscalculation or the false assumption of something which is out of touch with reality.
With this in mind, we can see that Estaban is irritated because he believes that his coworker Delores spends more time on the phone, while in reality, the customers have complex questions and this is a fundamental attribution error,
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