Home » Certification Exams Questions » LSSGB: Which of the following charts have upper control limits, but frequently have lower control limits of zero?

OPTIONS

  • X-bar and individual charts
  • c charts and u charts
  • p charts and np charts
  • R and sigma charts

ANSWER

R and sigma charts

EXPLANATION

X-bar and individual charts, u charts, p charts, and np charts have lower control limits. In case of some of the attribute charts, the calculated value is negative, which will be shown as zero. R and sigma charts are the charts that have an upper control limit, but may often have a lower control limit of zero.

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