In this paper we present part of a study carried out to identify Lebanese teachers' representations of probability as well as their teaching practices. We compare grades and judgments that teachers attribute to fictitious students. Our result show inconsistencies in grading on the same teacher: discrepancy between the quantitative judgment (grade) and the qualitative judgment that he attributes to the same answer. The comparison between the quantitative judgments (grades) and the qualitative judgments reveals a great diversity among teachers: a convergence in grading can hide very different qualitative judgments. This comparison contributed largely to the study of certain representations and practices of teachers, in particular those concerning the concept of independence of events.
The CAUSE Research Group is supported in part by a member initiative grant from the American Statistical Association’s Section on Statistics and Data Science Education