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In the context of an experiment, blocking refers to


Dividing subjects up in the such a way that they are in the group they wish to join.


Performing the experiment on a variety of different subjects to make generalizing the results to the population more effective.


Dividing the subjects up in such a way that the subjects in each group have less variability.


Performing the experiment on many different people as a way to reduce variability.


Hiring a third party so that neither the subjects nor the people conducting the experiment know who gets what treatment.

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