1. If interaction plots are parallel, there is no significant interaction.
   1. True
   2. False

2. The four-in-one residual plots help you evaluate the validity of the model; the residuals should be independent and normally distributed.
   1. True
   2. False

3. In the ANOVA table in a DOE. the sum-of-squares and F statistics provide a good measure of the effects of factors and interactions.
   1. True
   2. False

4. To test for curvature, include center points when creating the factorial design.
   1. 2k factorial
   2. Ultra HD
   3. 3G
   4. 5G

5. Factorial designs can model quadratic or second-order Y=f(x) relationships.
   1. True
   2. False

6. If curvature is significant, the model is a quadratic or second-order equation.
   1. True
   2. False

7. All of the following are true for a CCD or Central Composite Design EXCEPT .
   1. quadratic terms are determined by axial points
   2. main effects and interactions are determined by cube points (or comparable to corner points of a 2k experiment)
   3. CCDs are screening experiments
   4. curvature is determined by center points

8. Curved contours and curved surface plots are expected in .
   1. Fractional factorial designs
   2. One-factor-at-a-time experiments
   3. RSM
   4. Full factorial designs

9. Central Composite Design (CCD) is a very popular class of second-order designs.
   1. True
   2. False

10. If there is significant curvature, what should you use?
    1. fractional factorial designs
    2. 2k factorial designs
    3. full factorial designs
    4. response surface designs

11. What is the main purpose of the Control phase?
    1. brainstorm on ways to continually improve the process
    2. implement statistical process control (SPC) charts
    3. control the key Xs and monitor the Y to ensure the improved performance is sustainable
    4. start involving process owners and other stakeholders

12. The following are steps in the Control phase EXCEPT .
    1. once the improved Y is sustained, have Finance validate the actual financial impact
    2. develop a Control Plan for monitoring, controlling and regulating performance
    3. generate, evaluate and select solution alternatives to control Y
    4. implement SPC charts to support the Control Plan

13. The following tools and techniques are applicable in the Control phase, EXCEPT .
    1. FMEA
    2. Control Plan
    3. Process capability charts
    4. SPC charts

14. Which SPC chart should be used to monitor the number of defects in cars produced?
    1. np chart
    2. c chart
    3. p chart
    4. X-bar chart

15. Which SPC chart should be used to monitor the number of defective smartphones?
    1. u chart
    2. c chart
    3. np chart
    4. p chart

16. Which SPC chart should be used to monitor a key dimension (such as length) of parts that are mass produced?
    1. X-bar R chart
    2. I chart
    3. p chart
    4. u chart

17. Which SPC chart should be used to monitor the % defect rate?
    1. c chart
    2. p chart
    3. I-MR chart
    4. X-bar chart

18. Out-of-control (OOC) points indicate the presence of special causes.
    1. True
    2. False

19. Suppose that the process is in-control but isn't capable of meeting specifications due to excessive common-cause variation. What is the best course of action?
    1. Create an ANOVA table.
    2. Launch a Central Composite Design.
    3. Launch a Six Sigma DMAIC project.
    4. Create an SPC chart.

20. Control limits should be re-calculated whenever the process has undergone a major change such as a DMAIC project, new equipment or new technology.
    1. True
    2. False

21. Process capability and sigma level of the improved process should be determined in the Control phase, and a comparison should be made with the baseline performance from the Measure phase.
    1. True
    2. False