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Researchers at a car manufacturing unit are conducting a double-blind, controlled study to compare brake systems. What does double blind mean?

OPTIONS

Only blind attendants are used.
Special types of blinds are used.
Samples are kept confidential from customers.
Samples are kept confidential from testers.

ANSWER

Samples are kept confidential from testers.

EXPLANATION

Double blind experimental design means that the samples are kept confidential from testers.

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