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Six Sigma Black Belt Exam Prep

Category - Black Belt

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Researchers at a car manufacturing plant are conducting a double-blind, controlled study to compare 2 brake systems. What does double-blind mean in this context?
  1. only blind attendants are used
  2. special types of blinds are used
  3. samples are kept confidential from customers
  4. samples are kept confidential from testers
Explanation
Answer: D - Double-blind experimental design means that samples are kept confidential from testers.

Key Takeaway: To make sure that testers’ knowledge of which brake system is being tested, they are kept unaware until the experiments are finished. This type of experimental design is also referred to as a double-blind study and it is used extensively to increase the validity of experimental data.
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