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Which of the following are essential features to all statistically designed experiments?
O using humans and stratified samples
O using volunteers and the double-blind method
using a block design and the single-blind method
O using a block design and the double-blind method
O comparing several treatments and using chance to assign subjects to treatments

Respuesta :

E. comparing several treatments and using chance to assign subjects to treatments

For your question, the answer would be D.

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