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Monday, September 8, 2014

Why are these tough questions?

Each year after the dust has settled, Carey Bissonnette at the University of Waterloo reviews the CHEM 13 NEWS Exam statistics. As part of an item analysis, a point-biserial correlation coefficient is calculated for each of the 40 exam items (questions). Basically, this is the correlation that quantifies the relationship between how students do on each individual item versus the overall exam.