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Unformatted text preview: KEY 4 May 2010 IE330 Spring 2010 Final Exam Part 1: Mandatory (Chapters 15 and 16) No calculators, closed book, closed notes. Do not tear off any pages. 1 KEY 1. CHAPTER 15  True/False questions (3 points each, 15 points total) a. (TRUE or FALSE) In a sign test, the effect size is computed by dividing the difference in means by the standard error of the estimator. b. (TRUE or FALSE) For a Wilcoxon ranksum test, tied values are discarded. c. ( TRUE or FALSE) Comparisons between levels of the factor cannot be made when using a KruskalWallis test. d. ( TRUE or FALSE) If the data is symmetric but not normally distributed, the Wilcoxon signedrank test is preferred over the sign test. e. (TRUE or FALSE) Nonparametric tests should not be used when there are many outliers in the data that cannot be removed. 2. CHAPTER 15  Multiple choice questions (3 points each, 15 points total) a. Which of the following is useful for testing the stability of an alloy deformed by four different methods if the residuals are not normally distributed? i. Ztest ii. Sign test iii. KruskalWallis test iv. Wilcoxon signedrank test v. None of the above b. You have collected data on customer transaction times using one of two ATM display layouts. For each customer, you have a time when using display 1 and display 2, and you are interested in the effect of layout on the time it takes the customer to complete their transaction. The populations are not normally distributed. Which of the following tests could you use? i. Paired test ii. Sign test iii. Wilcoxon ranksum test iv. Wilcoxon signedrank test v. None of the above c. You are testing whether the mean of a population is equal to zero or not, but the data is not normally distributed. (The population is continuous.) Which of the following tests could you use for this purpose? i. 2 2 factorial test ii. Simple linear regression iii. KruskalWallis test iv. Wilcoxon ranksum test v. None of the above 2 KEY d. In running a simple linear regression, you find that the residuals have non constant variance, which cannot be stabilized using transformations. Which of the following nonparametric methods can be used instead? i. Wilcoxon signedrank test ii. Wilcoxon ranksum test iii. Sign test iv. KruskalWallis test v. None of the above e. Which of the following are true concerning the Wilcoxon signedrank test (choose all that are true)? i. The test compares the data against a hypothesized median ii. The data should be free of outliers iii. The counts of values above and below the median are compared. iv. The data should come from a uniform distribution v. None of the above 3. CHAPTER 16  True/False questions (3 points each, 15 points total) a. ( TRUE or FALSE) During the baseline process, it is recommended that 2550 subgroups are used....
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 Spring '11
 Jake

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