Several important variables help determine the quality of evidence. “B

Several important variables help determine the quality of evidence. “Blinding” is one of them. Blinding relates to what factor affecting quality of evidence?

1. The sample size is large enough to show an effect of the intervention.
2. The outcomes being measured accurately.
3. The research or evaluator not knowing if a participant is in the experimental or control group.
4. The attrition rate of the subjects.

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ANS: 3

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