Practice Test Geeks(CPS) Certified Process Specialist Practice Test
← All CPS Flashcard Decks

Analysis & Optimization Flashcards

7 cards from real CPS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Analysis & Optimization flashcards as text

  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:

    Answer: A disordinal interaction

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

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

    Answer: Histogram

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

  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?

    Answer: Analyze

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

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

    Answer: Reduced lead time and faster feedback on defects

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

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

    Answer: One-way ANOVA

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

  6. A process analyst notices the process mean has shifted but variation is unchanged on an X-bar chart. Which control chart would first signal this shift?

    Answer: CUSUM chart

    CUSUM (cumulative sum) charts are specifically designed to detect small, sustained shifts in the process mean faster than standard Shewhart charts.

  7. In Design of Experiments, 'resolution III' means:

    Answer: Main effects are confounded with two-factor interactions

    Resolution III designs confound main effects with two-factor interactions, meaning you cannot distinguish their individual contributions.