Substances to be tested for cancer-causing potential are often painted on the skin of mice. The question
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(a) What is the value of the Wilcoxon-Mann-Whitney test statistic for comparing the distributions?
(b) Let the alternative hypothesis be that benzo(a)pyrene concentrations tend to be high in group-housed mice than in singly housed mice. The P-value for the directional Wilcoxon-Mann-Whitney test is 0.004. If α = 0.01, what is your conclusion regarding H0?
(c) Why is a directional alternative valid in this case?
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Related Book For
Statistics For The Life Sciences
ISBN: 9780321989581
5th Edition
Authors: Myra Samuels, Jeffrey Witmer, Andrew Schaffner
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