The argument that Sarah can use to convince Noel of the correctness of her perception is that they have higher performance ratings than others in their department.
Being a part of the manager's ingroup, you are most likely to be favored by the manager. As the manager goes along with you and considers you as a part of the ingroup, he will consider you upper to other employees.
Sarah uses this perception to make it clear to Noel that they are a part of the manager's ingroup.
As the manager has given higher performance ratings to Sarah and Noel, then the perception that they are a part of the manager's ingroup seems to be correct.
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