alleryBlack and Wiliam's 1998 synthesis covered how many studies?
AMore than 50
BMore than 100
CMore than 250
DMore than 1000
Answer & Solution
Correct answer: C. More than 250
1. Marzano recalls Black and Wiliam's 1998 synthesis.
2. It found formative assessments have a more powerful effect on learning than summative ones.
3. The synthesis covered more than 250 studies.
_Source: Wikipedia, Formative assessment, Evidence_
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