Question: QUESTION 4 When an X-Bar chart is used to control a process using a sample size of twelve the Sigma chart should be used to

QUESTION 4 When an X-Bar chart is used to control a process using a sample size of twelve the Sigma chart should be used to estimate the process variation O the Range chart should be used to estimate the process variation either the Range or Sigma chart may be used to estimate the process variation none of the above

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