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Confounding
is a technique in which a subject doesn't know whether he or she is receiving a treatment or a placebo.
occurs in an experiment when you are not able to distinguish among the effects of different factors.
is the repetition of an experiment on more than one subject.
is used when subjects are assigned to different groups through a process of random selection.

Sagot :

Occurs in an experiment when you are not able to distinguish among the effects of different factors.
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