CPS Analysis & Optimization 4

Question 1

A process improvement team finds that changing machine speed and temperature each independently reduce defects, but together they increase defects. This is an example of:

Accepted Answer

A disordinal interaction

Answer

A disordinal (antagonistic) interaction occurs when the combined effect of two factors reverses the direction of benefit seen from each factor alone.

Question 2

Which tool is used to visually display the distribution shape, spread, and central tendency of continuous process data?

Accepted Answer

Histogram

Answer

A histogram displays frequency distribution of continuous data, revealing its shape (normal, skewed), spread, and approximate center.

Question 3

In a DMAIC project, during which phase would a team use a hypothesis test to confirm that an identified root cause is statistically significant?

Accepted Answer

Analyze

Answer

Hypothesis testing in the Analyze phase provides statistical evidence that a suspected factor genuinely influences the process output.

Question 4

A team reduces batch size from 50 to 5 units. The primary lean benefit of this change is:

Accepted Answer

Reduced lead time and faster feedback on defects

Answer

Smaller batches reduce queue wait time and surface defects sooner, shortening total lead time and the defect detection lag.

Question 5

Which statistical test should a practitioner use to compare the means of three or more process groups simultaneously?

Accepted Answer

One-way ANOVA

Answer

One-way ANOVA tests whether the means of three or more groups differ significantly without inflating Type I error from multiple t-tests.

(CPS) Certified Process Specialist Practice Test

(CPS) Certified Process Specialist Practice Test

CPS Analysis & Optimization 4