A branch of applied statistics dealing with planning, conducting, analyzing, and interpreting controlled tests to evaluate the factors that control the value of a parameter or group of parameters.

Question

Options

• ARandom Experiment
• BProbability
• CSix Sigma
• DDesign of Experiments

• A
  5% (2)
• B
  3% (1)
• C
  3% (1)
• D
  89% (33)

Explanation

Design of Experiments (DoE) is exactly defined as the branch of applied statistics concerned with planning, conducting, analyzing, and interpreting controlled tests to evaluate factors affecting a parameter - making D the precise match for the definition given.

Why the distractors are wrong:

• A (Random Experiment) refers to any trial with an uncertain outcome (like a coin flip) - it lacks the structured, controlled methodology described.
• B (Probability) is the mathematical measure of likelihood of an event - foundational to statistics, but not a methodology for designing tests.
• C (Six Sigma) is a quality improvement framework that uses DoE as one of its tools, but Six Sigma itself is broader and focuses on reducing process defects, not defining controlled experimentation.

Memory tip: Think of DoE as the blueprint for scientific testing - the word "Design" in the answer tells you it's about planning experiments with intent, which mirrors the definition's emphasis on controlled, deliberate evaluation.

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