Question: R3. 66: For a time-ordered variable control chart, what is the primary reason why subgroups should be kept as small as possible? A. So ranges

R3. 66:

For a time-ordered variable control chart, what is the primary reason why subgroups should be kept as small as possible?

  1. A. So ranges could be used instead of standard deviations
  2. B. To have the minimum opportunity for variation within a subgroup
  3. C. To save time
  4. D. So control limits may be narrower

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