If a process produces 150 defects in a lot size of 1,000 units. Each unit is tes

Question

If a process produces 150 defects in a lot size of 1,000 units. Each unit is tested for two types of defects (Diameter and surface finish). The Process Sigma level (with 1.5 Sigma shift) is estimated as:
If a process produces 150 defects in a lot size of 1,000 units. Each unit is tested for two types of defects (Diameter and surface finish). The Process Sigma level (with 1.5 Sigma shift) is estimated as:
If a process produces 150 defects in a lot size of 1,000 units. Each unit is tested for two types of defects (Diameter and surface finish). The Process Sigma level (with 1.5 Sigma shift) is estimated as:

Explanation / Answer

Number of defects observed, D = 150

Number of units in the sample, U = 1000

Opportunities per unit, O = 2 (each unit is tested for 2 defects)

DPMO = D/(U*O)*10^6 = 150/(1000*2)*10^6 = 75,000

Refer the sigma table, the process sigma level (with 1.5 sigma shift) corresponding to the above DPMO = 2.94

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