Impacto do outlier na média e na mediana: reflexões geradas por professores

Abstract

This article presents research developed in a context of continuing education, experienced by teachers who teach mathematics for the final years of elementary and high school. It is a qualitative study through which it seeks to interpret the professional knowledge made explicit by a group of 12 teachers from their participation in one of the activities of their qualification process. The data collected are analysed based on studies that discuss the knowledge necessary for teaching mathematics and reflect upon teaching practice. The interpretation of the participants' dialogues allows us to infer the increase in the level of literacy concerning the measures of central tendency (MCT) and the development of common and specialised content knowledge, especially from the reflection on whether the MCT are affected by outliers and whether they should be used to compose the data.