Question 1.  Calculating the average value of five sample measurements of a door width is an example of

• descriptive statistics.
• hypothesis testing.
• regression analysis.
• design of experiments.

Question 2.  A simple random sample is often use to estimate

• point estimates.
• random variables.
• statistics.
• population parameters.

Question 3. Which of the following is not a type of sampling scheme?

• Stratified sampling
• Biased sampling
• Cluster sampling
• Judgment sampling

Question 4.  Everything else remaining constant, when the sample size decreases, which of the following occurs?

• The sampling error decreases.
• The sampling error increases.
• The sampling error is unaffected.
• The sampling error could increase or decrease.

Question 5.  A process is said to be out of control when

• common causes are present.
• special causes are present.
• the process is not capable of meeting specifications.
• the upper and lower control limits cannot be computed.

Question 6.  _____ are the graphical components of regression analysis.

• Scatter diagrams
• Run charts
• Pareto diagrams
• Histograms

Question 7.  Data such as production volume, cost, and customer satisfaction indexes are often plotted on a _____, which displays the data over time.

• check sheet
• control chart
• run chart
• SIPOC diagram

Question 8.  For variables data, the sample means are assumed to be

• exponentially distributed.
• normally distributed.
• poisson distributed.
• binomially distributed.

Question 9.  The _____ is used to monitor the centering of the process.

• X-bar chart
• R-chart
• P-chart
• NP-chart

Question 10. In precontrol, which zone is not within nominal specification of a process?

• Gray zone
• Yellow zone
• Red zone
• Green zone