CQE Statistical Process Control 3

Question 1

A Pareto chart in quality improvement is based on which principle?

Accepted Answer

80% of effects come from 20% of causes

Answer

50% of defects come from 50% of causes

Answer

All defect causes are equally important

Answer

Defects follow a normal distribution

Question 2

What is the purpose of pre-control charts compared to traditional Shewhart control charts?

Accepted Answer

They provide a simpler setup check without requiring historical data

Answer

They use larger subgroup sizes for better accuracy

Answer

They are designed for attribute data only

Answer

They eliminate the need for control limits

Question 3

In a Measurement System Analysis (MSA), 'reproducibility' refers to variation caused by:

Accepted Answer

Different operators measuring the same part

Answer

The measurement device alone

Answer

Environmental factors only

Answer

Part-to-part variation

Question 4

What does the %GR&R statistic evaluate in a gauge R&R study?

Accepted Answer

The measurement system variation as a percentage of total process variation

Answer

The total number of defects in the sample

Answer

The gauge calibration frequency needed

Answer

The operator training effectiveness

Question 5

Which SPC chart is most appropriate for individual measurements when subgrouping is not practical?

Accepted Answer

Individuals and Moving Range (I-MR) chart

Answer

X-bar and S chart

Answer

p-chart

Answer

c-chart

Question 6

What does a high kurtosis value in a process distribution suggest about product quality risks?

Accepted Answer

The distribution has heavier tails, increasing the likelihood of extreme values

Answer

The process is perfectly centered

Answer

All measurements cluster tightly around the mean

Answer

The process is multimodal