PPT Slide
4) Reluctance to show an explicit uncertainty unless required (ɝ% from survey)
5) Tendency to report overly precise results (70 to 90% from survey, common exam)
Students rarely round final result in excess of proper precision. (ɝ%)
Students have a sense about how precisely times should be reported (meet me at 9:23 pm will elicit a puzzled look from most people), yet students do not recognize overly precise values in physics lab.