## Mat 510 Week 11 Final

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

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