In the criminal justice system, defendants accused of a crime are presumed innocent until proven guilty. Statistical inference in any context is built on an analogous principle: The null hypothesis--often a hypothesis of "no difference" or "no effect"--is presumed true unless there is sufficient evidence against it. In this…

Replicates an earlier study that used videotapes to examine the types of errors made by novice economics students in graphic analysis of a simple supply-demand problem. Further explores the issue by improving the framework for analyzing errors and documenting some methods used by novice groups to correct errors. (MJP)

The bilingual (Chinese/English) journal published annually for Hong Kong educators contains articles in a wide range of areas and at all levels of education. Articles include: "Micropolitics in Managing Bi-Sessional Primary Schools: A Case Study of the Interactions between Partner School Heads" (Cheung Wing-ming); "On Features of…