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Comparison of student evaluations of online formative assessments over time. Figure 4 shows student evaluations of online formative assessments from 2005–2007. Response rates were 52.1%, 51.5% and 48.5% (n = 237, 238 and 246) respectively, based on online surveys. Statistical analysis by Mann-Whitney U tests: # = p < 0.005 compared with 2005 cohort; ## = p < 0.001 compared with 2005 cohort; * = p < 0.005 compared with 2006 cohort; ** = p < 0.001 compared with 2006 cohort.
