Reference group bias occurs when individuals have different frames of reference (i.e. implicit standards), they use to answer the question they are being asked. For example, when students are asked to rate the competencies of their teachers, the individual standard for teacher quality impacts the rating that the student assigns the teacher. For instance, the notion of what it means for a teacher to keep his/her class in order is most probably affected by cultural and classroom context and so, two students who face the same performance from their teachers may rate their teachers’ classroom management skills differently.
Ou seja, não é tão simples assim.