Lean Six Sigma Yellow Belt Certification Statistical Thinking and Variation 3

Question 1

What does DPMO stand for in Six Sigma quality measurement?

Accepted Answer

Defects per Million Opportunities

Answer

Defective Parts per Manufacturing Output

Answer

Daily Process Measurement Operations

Answer

Data Points per Measurement Objective

Question 2

A process operating at Six Sigma quality produces approximately how many defects per million opportunities?

Accepted Answer

3.4 defects per million opportunities

Answer

Zero defects per million opportunities

Answer

66,807 defects per million opportunities

Answer

1,000 defects per million opportunities

Question 3

The 'sigma level' of a process measures:

Accepted Answer

How many standard deviations fit between the process mean and the nearest specification limit

Answer

The number of defects found during the last inspection

Answer

The average time between process failures

Answer

The total variation in a dataset

Question 4

Overadjusting a stable process that exhibits only common cause variation will:

Accepted Answer

Increase variation and worsen process performance

Answer

Reduce the amount of variation in the process

Answer

Have no effect on the process

Answer

Move the process to a higher sigma level

Question 5

Process capability analysis compares:

Accepted Answer

The natural process spread to the customer specification width

Answer

The process mean to the process median

Answer

Common cause variation to special cause variation

Answer

Control limits to the process average

Question 6

Which of the following best explains why reducing variation is central to Six Sigma?

Accepted Answer

Reduced variation makes processes more predictable and consistently meets customer requirements

Answer

Less variation lowers raw material costs

Answer

Variation reduction eliminates the need for quality inspections

Answer

Lower variation guarantees higher production volume

Question 7

In the context of statistical thinking, which statement about variation is correct?

Accepted Answer

Variation exists in every process and understanding its type guides the correct response

Answer

Variation can be completely eliminated with enough effort

Answer

All variation is harmful and must be treated as a special cause

Answer

Variation only matters when defects are visible to the customer