Use the following design matrix display to answer the following questions. Answer:

Question

Exhibit

Options

• Arandom order
• Brun order
• Cstandard order
• Dnone of the above
• Eall of the above

• A
  8% (3)
• B
  18% (7)
• C
  70% (28)
• D
  3% (1)
• E
  3% (1)

Explanation

In a Design of Experiments (DOE) context, a design matrix is displayed in standard order - the systematic, structured arrangement of all treatment combinations following Yates' order (e.g., factors cycle through low/high levels in a fixed pattern like −, +, −, +...). This is the canonical, pre-randomized listing of runs used to define the experiment's structure.

Why the distractors are wrong:

• A (random order): The design matrix display is not randomized - randomization happens separately when assigning actual run order.
• B (run order): Run order is the randomized sequence in which experiments are physically executed, which differs from the structured display.
• D/E: Since only C is correct, "none" and "all" are both eliminated.

Memory tip: Think "Standard = Structured/Systematic" - the design matrix is always shown in a neat, predictable standard order before you randomize it into a run order for actual execution. If it looks organized and patterned, it's standard order.

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