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Measures of Variability

Measures of Variability. In addition to knowing where the center of the distribution is, it is often helpful to know the degree to which individual values cluster around the center. This is known as variability . Range.

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The reliability of educational assessments Dylan Wiliam dylanwiliam

The reliability of educational assessments Dylan Wiliam www.dylanwiliam.net. Ofqual Annual Lecture, Coventry: 7 May 2009. The argument. The public understanding of the reliability of assessments is weak Contributory factors are

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Original scale units - PowerPoint PPT Presentation

Measures of Variability

The reliability of educational assessments Dylan Wiliam dylanwiliam