SPC Fundamentals 3

Question 1

What is the difference between Cp and Cpk?

Accepted Answer

Cp ignores centering; Cpk accounts for both spread and centering

Answer

Cp only measures whether the process spread fits within specifications, while Cpk also accounts for how well the process is centered between the limits.

Question 2

Which of the following is NOT one of Walter Shewhart's two types of variation?

Accepted Answer

Structural causes

Answer

Shewhart identified chance causes (common) and assignable causes (special); 'structural causes' is not part of his framework.

Question 3

A process producing 3.4 defects per million opportunities operates at what sigma level?

Accepted Answer

6 sigma

Answer

Six Sigma quality is defined as 3.4 DPMO, which accounts for a 1.5-sigma long-term shift in the process mean.

Question 4

Which type of data would you use an Individuals and Moving Range (I-MR) chart for?

Accepted Answer

Continuous data collected one observation at a time

Answer

The I-MR chart is designed for continuous variable data where only one measurement is produced at each time point.

Question 5

The term 'voice of the process' (VOP) in SPC refers to:

Accepted Answer

What control charts reveal about process behavior

Answer

VOP refers to what the data and control charts tell us about how the process is actually performing.

(SPC) Statistical Process Control Certification Practice Test

(SPC) Statistical Process Control Certification Practice Test

SPC Fundamentals 3