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In this paper we analyze the relevance of acquiring competence in building statistical graphs for pre-service primary school teachers. We summarize results from our own research that show examples of errors in graphs produced by pre-service teachers and suggest that these errors are consequence of scarce numerical sense in these teachers. Consequently, we suggest the interest of connecting the topics of Dealing with Data and Number Sense in the training of teachers, since these topics receivedoaj:93b763a3c4924ab2b87313bbfc7a632c fatcat:palzvaxagjbxrbjirqtrdg66ja