The Importance of Sustained Professional Development for Teaching Statistics -- An Example Involving the Mode and Range

摘要

This paper presents a progression of events from a case study that explored elementary school teachers' understanding of essential topics in statistics. One particular teacher revealed misconceptions regarding the mode and range during professional development. These misconceptions were corrected, the concepts taught appropriately in the classroom, and then the original misconceptions resurfaced. This example sheds light on the importance of sustained professional development.