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This study aims at analyzing teachers' didactical knowledge in Statistics, at the secondary level. It is mainly focused on teachers' statistical knowledge and perceptions of the students' difficulties in learning Statistics. Data were collected through a questionnaire which was sent to the 145 schools with secondary education classes in the Northern Educational District of Portugal. The questionnaire was administered to mathematics teachers, and 120 validated responses were obtained. The analysis of the data suggests that attention be paid to mathematics teacher education programs and professional development initiatives regarding the domain of Statistics. It seems of utmost importance that teachers develop their didactical knowledge in Statistics in order to help students to learn statistical concepts and procedures with meaning.

O CONHECIMENTO DIDÁCTICO EM ESTATÍSTICA: UM ESTUDO EXPLORATÓRIO COM PROFESSORES DE MATEMÁTICA DO ENSINO SECUNDÁRIO