# A manufacturer uses a large amount of a certain chemical. Since there are just two suppliers of this chemical, the

## Question:

a. Use the Wilcoxon rank sum test to determine whether there is a difference in the contaminant percentages for the two suppliers. Use Î± = .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 Î± = .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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