Lean Six Sigma Black Belt Certification Basic 3

Question 1

Which statistical tool is most appropriate for determining whether a statistically significant difference exists between the means of three or more independent groups?

Accepted Answer

One-way ANOVA

Answer

One-way ANOVA (Analysis of Variance) tests whether the means of three or more independent groups differ significantly by comparing within-group and between-group variance.

Question 2

In a control chart, what does a 'run of 8 consecutive points on one side of the center line' indicate?

Accepted Answer

A special cause that should be investigated

Answer

According to Western Electric rules, 8 or more consecutive points on the same side of the center line is a non-random pattern indicating a special cause of variation.

Question 3

Which document formally authorizes a Six Sigma project and assigns the Black Belt?

Accepted Answer

Project charter

Answer

The project charter defines the project scope, goals, timeline, team roles, and business case, and it serves as the official authorization to proceed.

Question 4

The 7 wastes of Lean are represented by the acronym TIMWOOD. What does the 'M' stand for?

Accepted Answer

Motion

Answer

In TIMWOOD (Transportation, Inventory, Motion, Waiting, Over-processing, Overproduction, Defects), 'M' stands for Motion — unnecessary movement of people.

Question 5

A Gauge R&R study reveals that %GRR is 28%. How should this measurement system be classified?

Accepted Answer

Marginal — may be acceptable depending on context

Answer

A %GRR between 10% and 30% is considered marginal; acceptability depends on the application's importance and cost of measurement improvement.

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Practice Test

Lean Six Sigma Black Belt Certification Basic 3