Home » Certification Exams Questions » LSSGB: Variable control chart subgroup sizes are generally 3, 4, 5, or 6 for all of the following reasons EXCEPT:

OPTIONS

  • They are large enough so that averages of data will follow the normal distribution
  • They fit onto traditional chart paper very well
  • Larger sizes permit an opportunity for process changes within the subgroup
  • They permit a separation of within time from time-to-time variation

ANSWER

They fit onto traditional chart paper very well

EXPLANATION

Please note that a negative response is requested. The weakest selection is option b. Control chart paper was developed to support a logical control chart sample size. Sample sizes should not be chosen to fit a handy form. The other items have merit.

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