Understanding to what extent preservice teachers are capable of conceptual and procedural knowledge of data displays is the aim of this study through analyzing a part of data collected during an independent study course. Change in the middle school curriculum in Turkey necessitates the study of examination of understanding of PEMT about statistics. Therefore, this study is significant in supporting the needs of teacher educators as well as it contributes to the consequences of curriculum efforts. In order to possess an understanding of statistical concepts for preservice mathematics teachers, they must have both conceptual and procedural knowledge (Hiebert & Lefevre, 1986), which is the main concern of this study.