In the literature means, modes and medians are referred as measures of central tendency and they are important concepts in data handling and analysis. Some authors (Batanero et al., 1994; Carvalho, 1996, 1998; Cudmore, 1996; Hawkins, Jolliffe and Glickman, 1991) also stress that students have difficulty with these basic concepts and to some of them these concepts can be reduced to a computation formula. The main goal of this study was to analyse peer interactions in order to understand their role in pupils' performances when they were solving statistical tasks. A deep analysis of their discourse makes clear the way they construct an intersubjectivity (Wertsch, 1991) that facilitates the choice of the solving strategies and helps pupils to undertake their mistakes.
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