SPC Fundamentals

Question 1

What is the main purpose of Statistical Process Control (SPC)?

Accepted Answer

Monitor and control process variation

Answer

SPC is used to monitor and control a process to ensure it operates at its full potential to produce conforming product.

Question 2

What does a control chart indicate in SPC?

Accepted Answer

Process stability and variation

Answer

Control charts show whether a process is in statistical control by detecting variation beyond normal limits.

Question 3

What is the term for variation caused by unpredictable events in a process?

Accepted Answer

Special cause variation

Answer

Special cause variation refers to unexpected changes due to external or assignable causes.

Question 4

Which chart type is used for attribute data in SPC?

Accepted Answer

P-chart

Answer

P-charts are used to monitor the proportion of defective items in a sample and are suitable for attribute data.

Question 5

What does it mean if all points fall within control limits on a control chart?

Accepted Answer

Process is stable and in control

Answer

If all points are within limits and show no pattern, the process is considered to be in control.

(SPC) Statistical Process Control Certification Practice Test