A manufacturer uses a large amount of a certain chemical. Since there are just two suppliers of this chemical, the
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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.
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Related Book For
Introduction To Probability And Statistics
ISBN: 9781133103752
14th Edition
Authors: William Mendenhall, Robert Beaver, Barbara Beaver
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Question Posted: April 15, 2016 07:49:07