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20-01-2021
Mathematics

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17. Generally speaking, which of the following is necessary to conduct either a single-blind or double-blind study?

O Control group

Blocking

Placebo

O Association

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20-01-2021

Control group.

A single or double blind study means that either the participants or the researchers or both does not know who is in the control group and who is in the experimental group. This, there has to be a control group

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