Six Sigma & SPC interview questions

1. A.variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean
2. B.define, measure, analyse, improve and control, the roadmap for improving an existing process
3. C.performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2
4. D.(USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred

Answer + AI explanation with Pro

1. A.X-bar and R chart
2. B.Gauge R&R
3. C.DMAIC
4. D.Cpk

Answer + AI explanation with Pro

1. A.DMAIC — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
2. B.DMAIC — define, measure, analyse, improve and control, the roadmap for improving an existing process
3. C.DMAIC — out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
4. D.DMAIC — measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%

Answer + AI explanation with Pro

1. A.variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean
2. B.out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
3. C.planned variation of several factors at once, using factorial or Taguchi orthogonal arrays, to quantify main effects and interactions
4. D.3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean

Answer + AI explanation with Pro

1. A.Design of experiments
2. B.Six sigma quality level
3. C.DMAIC
4. D.Pp and Ppk

Answer + AI explanation with Pro

1. A.Six sigma quality level — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
2. B.Six sigma quality level — planned variation of several factors at once, using factorial or Taguchi orthogonal arrays, to quantify main effects and interactions
3. C.Six sigma quality level — out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
4. D.Six sigma quality level — (USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred

Answer + AI explanation with Pro

1. A.out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
2. B.3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
3. C.variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean
4. D.(USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred

Answer + AI explanation with Pro

1. A.Six sigma quality level
2. B.Pp and Ppk
3. C.Western Electric rules
4. D.Cp

Answer + AI explanation with Pro

1. A.Cp — out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
2. B.Cp — (USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred
3. C.Cp — variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean
4. D.Cp — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean

Answer + AI explanation with Pro

1. A.performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2
2. B.(USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred
3. C.variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean
4. D.smaller of (USL − mean)/3σ and (mean − LSL)/3σ, accounting for centring, with 1.33 the usual minimum and 1.67 asked for new processes

Answer + AI explanation with Pro

1. A.Cpk
2. B.DMAIC
3. C.X-bar and R chart
4. D.Design of experiments

Answer + AI explanation with Pro

1. A.Cpk — smaller of (USL − mean)/3σ and (mean − LSL)/3σ, accounting for centring, with 1.33 the usual minimum and 1.67 asked for new processes
2. B.Cpk — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
3. C.Cpk — define, measure, analyse, improve and control, the roadmap for improving an existing process
4. D.Cpk — measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%

Answer + AI explanation with Pro

1. A.performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2
2. B.3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
3. C.planned variation of several factors at once, using factorial or Taguchi orthogonal arrays, to quantify main effects and interactions
4. D.define, measure, analyse, improve and control, the roadmap for improving an existing process

Answer + AI explanation with Pro

1. A.Pp and Ppk
2. B.Western Electric rules
3. C.Cpk
4. D.DMAIC

Answer + AI explanation with Pro

1. A.Pp and Ppk — define, measure, analyse, improve and control, the roadmap for improving an existing process
2. B.Pp and Ppk — (USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred
3. C.Pp and Ppk — out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
4. D.Pp and Ppk — performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2

Answer + AI explanation with Pro

1. A.out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
2. B.measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%
3. C.variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean
4. D.3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean

Answer + AI explanation with Pro

1. A.Six sigma quality level
2. B.Design of experiments
3. C.Cpk
4. D.X-bar and R chart

Answer + AI explanation with Pro

1. A.X-bar and R chart — (USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred
2. B.X-bar and R chart — measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%
3. C.X-bar and R chart — out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
4. D.X-bar and R chart — variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean

Answer + AI explanation with Pro

1. A.define, measure, analyse, improve and control, the roadmap for improving an existing process
2. B.out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
3. C.measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%
4. D.performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2

Answer + AI explanation with Pro

1. A.Western Electric rules
2. B.Cp
3. C.Pp and Ppk
4. D.Cpk

Answer + AI explanation with Pro

1. A.Western Electric rules — performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2
2. B.Western Electric rules — out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
3. C.Western Electric rules — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
4. D.Western Electric rules — (USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred

Answer + AI explanation with Pro

1. A.measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%
2. B.performance indices that use the overall long-term standard deviation instead of the within-subgroup sigma estimated from R-bar/d2
3. C.define, measure, analyse, improve and control, the roadmap for improving an existing process
4. D.out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre

Answer + AI explanation with Pro

1. A.DMAIC
2. B.Gauge R&R
3. C.Six sigma quality level
4. D.Cp

Answer + AI explanation with Pro

1. A.Gauge R&R — smaller of (USL − mean)/3σ and (mean − LSL)/3σ, accounting for centring, with 1.33 the usual minimum and 1.67 asked for new processes
2. B.Gauge R&R — planned variation of several factors at once, using factorial or Taguchi orthogonal arrays, to quantify main effects and interactions
3. C.Gauge R&R — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
4. D.Gauge R&R — measurement system study splitting variation into repeatability (equipment) and reproducibility (appraisers), acceptable below 10% of tolerance and rejected above 30%

Answer + AI explanation with Pro

1. A.out-of-control tests such as one point beyond 3σ, two of three beyond 2σ, four of five beyond 1σ or eight in a row on one side of centre
2. B.(USL − LSL) divided by 6σ, the potential capability of a process ignoring how well it is centred
3. C.planned variation of several factors at once, using factorial or Taguchi orthogonal arrays, to quantify main effects and interactions
4. D.variable control chart tracking subgroup means and ranges, with control limits at ±A2·R-bar around the grand mean

Answer + AI explanation with Pro

1. A.Pp and Ppk
2. B.Six sigma quality level
3. C.Cp
4. D.Design of experiments

Answer + AI explanation with Pro

1. A.Design of experiments — 3.4 defects per million opportunities, which assumes a long-term 1.5-sigma shift of the process mean
2. B.Design of experiments — planned variation of several factors at once, using factorial or Taguchi orthogonal arrays, to quantify main effects and interactions
3. C.Design of experiments — smaller of (USL − mean)/3σ and (mean − LSL)/3σ, accounting for centring, with 1.33 the usual minimum and 1.67 asked for new processes
4. D.Design of experiments — define, measure, analyse, improve and control, the roadmap for improving an existing process

Answer + AI explanation with Pro