Home » Certification Exams Questions » CSM - Certified Scrum Master » In a sigma chart, what is the precise reason for calculating Sigma separately for each subgroup rather than calculating grand average for sigma?

OPTIONS

  • Sub group statistics are important to be represented
  • Sub group sigma is generally more accurate
  • Sub group sigma doesn’t introduce unnecessary special cause
  • Range is considered better than Sigma

ANSWER

Sub group sigma doesn’t introduce unnecessary special cause

EXPLANATION

Sub group sigma doesn’t introduce unnecessary special cause – It is this reason why Sigma is calculated for each subgroup rather than calculating the grand sigma.

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