Question: A manufacturer uses a large amount of a certain chemical. Since there are just two suppliers of this chemical, the manufacturer wishes to test whether
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a. Use the Wilcoxon rank sum test to determine whether there is a difference in the contaminant percentages for the two suppliers. Use α = .05.
b. Use the large-sample approximation to the Wilcoxon rank sum test to determine whether there is a difference in the contaminant percentages for the two suppliers. Use α = .05. Compare your conclusions to the conclusions from part a.
7 51032 .1 502966 55 13 65 .50 04 41 616504 692851 867144
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