Quiz8a_KEY_Sp11

Quiz8a_KEY_Sp11 - A Name: _KEY_ 20 April 2011 IE330 Spring...

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Name: _______________KEY_____________________ A 20 April 2011 IE330 Spring 2011 Closed book, closed notes, no calculators Quiz #8a For all questions, refer to these figures and output. Please keep your answers short. 7 Median Mean 6 5 4 3 2 1 1st Q uartile 1.2500 Median 3.0000 3rd Q uartile 5.7500 Maximum 7.0000 2.1129 5.0538 1.2631 5.7369 1.6395 3.9294 A -Squared 0.52 P-V alue 0.144 Mean 3.5833 StDev 2.3143 V ariance 5.3561 Skewness 0.34775 Kurtosis -1.50045 N 12 Minimum 1.0000 A nderson-Darling Normality Test 95% C onfidence Interv al for Mean 95% C onfidence Interv al for Median 95% C onfidence Interv al for StDev 95% Confidence Intervals Summary for Rating Wilcoxon Signed Rank Test: Rating Test of median = 4.000 versus median < 4.000 N for Wilcoxon Estimated N Test Statistic P Median Rating 12 12 31.0 0.278 3.500
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Name: _______________KEY_____________________ A In this example, 12 drivers, selected at random, were asked to rate the handling quality of a new car from 1 – 7, where 1 = Very poor and 7 = Excellent. (A rating of 4 is adequate.) The null hypothesis is that the median rating is less than 4. 1. Identify the assumptions of the Wilcoxon signed rank test and whether you think they have been met in this case or not.
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Quiz8a_KEY_Sp11 - A Name: _KEY_ 20 April 2011 IE330 Spring...

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