Mathematical statistics is an advanced subject that has abstract concepts and requires higher-order thinking skills. This research was conducted to determine the composition of the types of errors committed by 33 students using the Newman errors analysis. The sample was taken by purposive sampling in solving mathematical statistics material problems. This descriptive qualitative research uses written test techniques, interviews, and documentation in collecting data. The results showed that the level of errors made by students on the type of reading errors was in the very low category for all student ability levels (high, medium, and low). Students experience problems in mastering prerequisite materials that have not been mastered well (especially probability and integral), incomplete understanding of the definition of a concept, or errors in calculations
