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# FinalA_KEY_2009 - Name_KEY 7 May 2009 IE330 Spring 2009...

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Name: __________________KEY________________________ 7 May 2009 IE330 Spring 2009 Final Exam A Part 1: Mandatory No calculators, closed book, closed notes. Do not tear off any pages. 1 of 24

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Name: __________________KEY________________________ 1. CHAPTER 15 - True/False questions (3 points each, 15 points total) a. ( TRUE or FALSE) To conduct a Wilcoxon signed-rank test, the distribution must be symmetric. b. ( TRUE or FALSE) When conducting a sign test, values that are tied with the hypothesized value should be thrown out. c. ( TRUE or FALSE) In a Wilcoxon rank-sum test, the populations must have the same shape and spread for the test to be valid. d. ( TRUE or FALSE) A Kruskal-Wallis test could be used in place of a one factor ANOVA when there is non-constant variance between the levels of the factor. e. (TRUE or FALSE) The sign test should not be used when there are many outliers in the set of data. 2. CHAPTER 15 - Multiple choice questions (3 points each, 15 points total) a. You are testing whether H0: µ = 3.5 vs H1: µ ≠ 3.5, but the population is not normally distributed. Which of the following nonparametric tests could you use to conduct the same (or a similar) test (choose all that could be used)? i. Sign test ii. Paired test iii. Wilcoxon signed-rank test iv. Wilcoxon rank-sum test v. None of the above b. You are conducting a two-factor ANOVA, but find the data is not normally distributed. Which of the following nonparametric tests should you conduct instead? i. Regression ii. Kruskal-Wallis test iii. Wilcoxon signed-rank test iv. 2 2 factorial test v. None of the above c. Which of the following could be used to construct a 95% confidence interval on the median when the data is not normally distributed? i. Sign test ii. Kruskal-Wallis test iii. Wilcoxon signed-rank test iv. Z-test v. None of the above 2 of 24
Name: __________________KEY________________________ d. Which of the following are true concerning the sign test (choose all that are true)? i. The counts of values above and below the median are compared. ii. The data should come from a uniform distribution iii. The test compares the data against a hypothesized median iv. The data should be free of outliers v. None of the above e. Which of the following nonparametric tests are more powerful than their parametric equivalent when the parametric assumptions have been met (choose all that are correct)? i. Sign test ii. Kruskal-Wallis test iii. Wilcoxon signed-rank test iv. Wilcoxon rank-sum test v. None of the above 3. CHAPTER 16 - True/False questions (3 points each, 15 points total) a. ( TRUE or FALSE) Common causes of variation are a normal part of the variability in the process. b. (TRUE or FALSE) Subgroups normally contain 25 – 50 observations. c. (TRUE or FALSE) PCR is used instead of PCR k whenever the process is not centered. d. ( TRUE or FALSE) During monitoring of a process using statistical process control, having even one point outside the control limits indicates an out-of-control process.

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