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What is formative assessment's effect size on standardized tests in Black and Wiliam's 1998 report?

ABetween 0.4 and 0.7
BBetween 4 and 7
CBetween 0.01 and 0.1
DBetween 1.4 and 1.7
Answer & Solution
Correct answer: A. Between 0.4 and 0.7
1. Black and Wiliam (1998) reported effect sizes between 0.4 and 0.7. 2. This is a large effect for educational interventions. 3. Values near zero or above 5 are not reported. _Source: Wikipedia, Formative assessment, In elementary education_
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