PROTO-BAYESIAN REASONING OF CHILDREN IN FOURTH

This paper is dedicated to the ecological rationality of certain information formats that facilitate proto-Bayesian reasoning by children. The formats of representation introduced are en-active, iconic and even symbolic and are based on so-called natural frequencies. Experiments are described that have been performed with fourth-graders recently at schools in Berlin and Ludwigsburg and which exhibit the success of these formats for fostering proto-Bayesian reasoning. Results on activities with a special website dedicated to conditional probabilities and Bayesian reasoning (www.eeps.com/riskicon) are also presented and discussed.