A r c h i v e d I n f o r m a t i o n
Evidence-Based Education (EBE)
Student Achievement and School Accountability Conference
October 2002
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Text (slide 17):
Why is randomization critical?
- Assures that the participants being compared have the same characteristics across the conditions
- Rules of chance mean that the smart, motivated, experienced, etc. have the same probability of being in condition 1 as in condition 2
- Without randomization, differences between two conditions may result from pre-existing difference in the participants and subtle selection biases
