In blinding levels, which definition is correct?

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Multiple Choice

In blinding levels, which definition is correct?

Explanation:
Blinding levels describe who is kept unaware of the treatment assignment to reduce bias. In a double-blind design, neither the participants nor the investigators know which treatment each participant receives. This prevents participants’ expectations from influencing their reports and prevents investigators from unintentionally guiding treatment or assessing outcomes differently. That makes the double-blind definition the correct one here. A single-blind design would have only participants unaware, with investigators aware. Triple-blind adds unawareness of outcome assessors, and quadruple-blind also keeps data analysts in the dark.

Blinding levels describe who is kept unaware of the treatment assignment to reduce bias. In a double-blind design, neither the participants nor the investigators know which treatment each participant receives. This prevents participants’ expectations from influencing their reports and prevents investigators from unintentionally guiding treatment or assessing outcomes differently.

That makes the double-blind definition the correct one here. A single-blind design would have only participants unaware, with investigators aware. Triple-blind adds unawareness of outcome assessors, and quadruple-blind also keeps data analysts in the dark.

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