Homework 8

# Homework 8 - Ze Xuan Zhang IE 330 Homework 8 1 c The graph...

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IE 330 Homework 8 1. c . The graph appears not to be normally distributed; the p-value is above 0.05, which also indicate the sample is not normally distributed. d. Mean = 40.6, medium = 35. From the graph, the central tendency seems to be the medium. e. Although all data fills within the 95% confidence interval, the P-value is 0.067, which is greater than 0.05, the data is not normally distributed. f. Sign test of median = 21.00 versus not = 21.00 N Below Equal Above P Median Sample Days between Incidents 10 0 1 9 0.0039 35.00 The P-value is very small, which indicate the null hypothesis is wrong, the medium is not 21. The new mean should be 35. g. For Wilcoxon signed rank test to work the sample needs to be symmetric, this data is not symmetric. 2. b. P-value is higher than 0.05, sample is not normally distributed. c. The sample is symmetric, which means the assumptions for Wilcoxon signed rank test is met. d.

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Homework 8 - Ze Xuan Zhang IE 330 Homework 8 1 c The graph...

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