1. Which of the following statements is true about a design of experiments methodology?
a. Two-way interactions can confound with other two-way interaction
b. The sign of the interaction is determined by adding the signs of the main factors together
c. The run order of the trials in a full factorial should NEVER be randomized
d. The output of a process is not impacted by higher order interactions
2. Which of the following do we typically use with Design of Experiments?
a. ANOVA
b. z-test
c. t-test
d. All of the above
3. Which of the following is a subdivision of Design of Experiment that is divides the trials into relatively homogenous units to minimize the effects of noise?
a. Replicating
b. Confounding
c. Blocking
d. Aliasing
4. Which of the following scenarios is NOT considered special-cause variation?
a. Seven (7) or more points in a row steadily increasing or decreasing
b. Nine (9) or more consecutive points on the same side of the center line
c. Three (3) points outside the control limits
d. Points distributed randomly outside the specification limits
5. What varies more, averages or individuals?
a. Averages vary more than individuals
b. Individuals vary more than averages
c. There is no difference between the two
d. There are only theories
6. The Weibull distribution is used:
a. To optimize centering
b. To optimize dispersion
c. To determine reliability
d. None of the above
7. Which of the following tool(s) is/are used to illustrate what is having a significant impact in the analysis of design of experiments?
a. ANOVA
b. Effect plots (main effects and interactions)
c. Response surface
d. All of the above
8. Which of the following is an advantage of design of experiments?
a. The factor or factors are in a state of statistical control
b. This methodology is normalized due to the central limit theorem
c. Main effects are confounded with two-way interactions
d. With Design of Experiments, each factor is tested an equal number of times. It is balanced.
9. Randomization in a Design of Experiments methodology is used to
a. Cut down of the cost of experimentation
b. Spread out NOISE (uncontrollable variation) across the experimental trials
c. Standardize the order of the running of the experimental trials (e.g. standard-order designs)
d. Decrease the number of replicates and/or repeats
10. An IT department wants to show that the average salary of ALL Java programmers is greater than $45,000 based on a sample of 50. Which of the following is a correct null hypothesis statement? Caution: All Java programmers.
a. is less than, or equal to $45,000
b. is less than, or equal to $45,000
c. is not equal to $45,000
d. is not equal to $45,000