**Question 1**

4 out of 4 points

In every experiment there is experimental error. Which of the following statements is true?Answer | ||||

Selected Answer: This error can be changed statistically by increasing the degrees of freedomCorrect Answer: This error can be changed statistically by increasing the degrees of freedom |

**Question 2**

4 out of 4 points

This technique is used to eliminate the effects of nuisance factors (e.g., machines, day of week, and season of year) from an experiment.Answer | ||||

Selected Answer: BlockingCorrect Answer: Blocking |

**Question 3**

4 out of 4 points

An aspect of good experimental strategy is to study the effects of the variables (Xs) over a wide range. This strategy increases the chances that effects will be found because:Answer | ||||

Selected Answer: The size of the effect relative to the experimental variation is increasedCorrect Answer: The size of the effect relative to the experimental variation is increased |

**Question 4**

4 out of 4 points

A 32 experiment means that we are experimenting with:Answer | ||||

Selected Answer: Three levels of two factorsCorrect Answer: Three levels of two factors |

**Question 5**

4 out of 4 points

Given the plot below, what might you suspect about factors A and B? Answer | ||||

Selected Answer: The effect of A depends on the level of BCorrect Answer: The effect of A depends on the level of B |

**Question 6**

4 out of 4 points

Which type of variation was critical to resolving the realized revenue case study?Answer | ||||

Selected Answer: Structural variationCorrect Answer: Structural variation |

**Question 7**

4 out of 4 points

Figure 2.15 displays a model of the statistics discipline, showing the relationship between statistical thinking, statistical engineering, and statistical methods and tools. Which of the following is a principle illustrated by this model?Answer | ||||

Selected Answer: Statistical engineering links the methods and tools to the statistical thinking philosophy, to ensure they are appropriately appliedCorrect Answer: Statistical engineering links the methods and tools to the statistical thinking philosophy, to ensure they are appropriately applied |

**Question 8**

4 out of 4 points

The model residuals are examined to:Answer | ||||

Selected Answer: All of the aboveCorrect Answer: All of the above |

**Question 9**

4 out of 4 points

A statistic that is used to indicate too much correlation between the predictors in a regression analysis is called the:Answer | ||||

Selected Answer: Variance inflation factorCorrect Answer: Variance inflation factor |

**Question 10**

4 out of 4 points

The best way to evaluate the validity of a statistical model is:Answer | ||||

Selected Answer: All of the aboveCorrect Answer: All of the above |

**Question 11**

4 out of 4 points

George Box tells us “all models are wrong but some are useful”. By this comment he means:Answer | ||||

Selected Answer: B and CCorrect Answer: B and C |

**Question 12**

4 out of 4 points

Models based on subject matter fundamentals (theory) are generally better than statistical models for:Answer | ||||

Selected Answer: A and BCorrect Answer: A and B |

**Question 13**

4 out of 4 points

We are testing the null hypothesis that the average monthly revenue between four insurance offices is the same. We obtained a p-value of .07. Which of the following would be an appropriate conclusion about the population?Answer | ||||

Selected Answer: None of the aboveCorrect Answer: None of the above |

**Question 14**

4 out of 4 points

I have calculated an interval to document the uncertainty in my estimate of the long-term standard deviation I will experience in time to pay invoices in my business going forward. Baaed on this information, this should be considered what type of interval?Answer | ||||

Selected Answer: Confidence interval for a parameterCorrect Answer: Confidence interval for a parameter |

**Question 15**

0 out of 4 points

After running an ANOVA comparing the average years of experience between five different job classifications, we obtained a p value of .02. Which of the following would be a reasonable conclusion concerning the population in this case?Answer | ||||

Selected Answer: None of the aboveCorrect Answer: We have strong evidence to state that at least two of the job classifications have different average ages |

**Question 16**

4 out of 4 points

For which of the following scenarios am I most likely to utilize a Chi-squared test?Answer | ||||

Selected Answer: Comparing the proportion of employees who take 10 or more sick days a year between three manufacturing plantsCorrect Answer: Comparing the proportion of employees who take 10 or more sick days a year between three manufacturing plants |

**Question 17**

4 out of 4 points

Which of the following could be considered a prediction interval?Answer | ||||

Selected Answer: An interval documenting uncertainty in the average of the next month’s daily revenuesCorrect Answer: An interval documenting uncertainty in the average of the next month’s daily revenues |

**Question 18**

4 out of 4 points

Improvement is needed for an organization to survive because:Answer | ||||

Selected Answer: All of the aboveCorrect Answer: All of the above |

**Question 19**

4 out of 4 points

Control limits were originally defined at the three-sigma level because:Answer | ||||

Selected Answer: This level provides a good balance between the risks of having “false alarms” and missing special causesCorrect Answer: This level provides a good balance between the risks of having “false alarms” and missing special causes |

**Question 20**

4 out of 4 points

If my histogram appears bimodal, what tool might help me evaluate why?Answer | ||||

Selected Answer: StratificationCorrect Answer: Stratification |

**Question 21**

4 out of 4 points

In evaluating data on our process outputs, four characteristics we might investigate are: central tendency, variation, shape of distribution, and stability. Which of the following tools would be most helpful to determine stability of the process?Answer | ||||

Selected Answer: Run chartCorrect Answer: Run chart |

**Question 22**

4 out of 4 points

The histogram has which of the following limitations?Answer | ||||

Selected Answer: It hides the effect of process instabilityCorrect Answer: It hides the effect of process instability |

**Question 23**

4 out of 4 points

Non-random and unpredictable patterns on a control chart indicate:Answer | ||||

Selected Answer: Special cause variationCorrect Answer: Special cause variation |

**Question 24**

4 out of 4 points

Refer to Figure 3.21 and choose the correct statement for the measurementsAnswer | ||||

Selected Answer: Measure C is not accurate but has good precisionCorrect Answer: Measure C is not accurate but has good precision |

**Question 25**

4 out of 4 points

Processes are important because:Answer | ||||

Selected Answer: All of the aboveCorrect Answer: All of the above |